10 Garantiebedingungen

AKG gewhrt 1 Jahr Garantie ab Verkaufsdatum auf nachweisbare Material- und Fabrikationsfehler. Der Garantieanspruch erlischt bei unsachgemer Handhabung, elektrischer oder mechanischer Beschdigung durch mibruchliche Anwendung sowie bei unsachgemer Reparatur durch nichtautorisierte Werksttten. Voraussetzung fr die Garantieleistung ist die Vorlage der Kaufrechnung. Transport- und Portospesen, welche aus der Einsendung des Gertes zur Garantiereparatur erwachsen, knnen von AKG nicht bernommen werden, das Risiko der Zusendung trgt der Kunde. Die Garantie wird ausschlielich fr den ursprnglichen Kufer geleistet. Batterien und Akkus sind von der Garantie ausgenommen.

Contents

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Introduction. Description. Precautions. Unpacking. Controls. Operating Notes Important Notes. Specifications. Troubleshooting. Warranty. 9 9

1 Introduction

Dear customer: Thank you for purchasing an AKG product. The K 305 UHF/K 405 UHF wireless headphone system is based on advanced UHF transmission technology. In order to make optimum use of the benefits of your K 305 UHF/K 405 UHF, please take a few minutes to read the instructions below carefully before operating the equipment. Please keep the manual for future reference.

2 Description

The K 305 UHF/K 405 UHF headphone system uses state-of-the-art UHF radio transmission technology; connects to any audio, video, or TV set with a headphones, line, or recording output; provides perfect sound reproduction, full mobility, and signal transmission through walls and ceilings over a distance of up to 330 feet (100 m). The K 305 UHF/K 405 UHF system lets you share your listening enjoyment with other persons. You can operate your transmitter with several headphones simultaneously. K 305 UHF/K 405 UHF headphones are available separately.

3 Precautions

1. Operate the headphones with two AAA size 1.2 V rechargeable or 1.5 V dry batteries only. 2. Never try to charge dry batteries using the transmitters charging feature. 3. Before charging the headphones batteries, always make sure that the batteries in the headphones are rechargeable types. 4. Dispose of spent dry or rechargeable batteries conforming to local waste disposal rules. Never throw batteries into the fire. 5. Operate the transmitter with the supplied 12 VDC, 200 mA AC adapter only. Check that the AC voltage stated on the AC adapter is the same as that available in your country. Using the transmitter with a different AC adapter voids the warranty. 6. Always switch the headphones OFF after use. 7. Never try to open the headphone or transmitter case. Refer servicing to qualified service personnel only. 8. Never place the equipment near heat sources such as radiators or electric heaters or expose it to direct sunlight, excessive dust, humidity, rain, vibrations, or impacts. 9. Never use alcohol, petroleum-based cleaners, or paint thinners to clean the headphone or transmitter case. 10. If you do not use your transmitter for an extended period of time (e.g., when traveling), disconnect the AC adapter from the AC outlet. 11. Also refer to section 7 Important Notes.

4 Unpacking

Your headphone system package contains the following components: K 305 UHF or K 405 UHF headphones
adapter is the same as that available in your country. If it is, connect the AC adapter to a convenient AC outlet (see fig. 4). The transmitter will automatically be ready to operate. Note that the transmitter will switch on as soon as it detects an audio signal at the AUDIO IN jacks or the jack. 6.2 Connecting the Transmitter to Your Audio Source You may connect the transmitter either to a headphones output (mini jack or 1/4 jack), LINE, or REC outputs. 6.2.1 Connecting to a Headphones Output 1. Before connecting the transmitter to your audio source, switch the audio source OFF. 2. Referring to fig. 5, plug the red RCA connector (right channel) on the supplied connecting cable into the red AUDIO IN R socket (7) and the white RCA connector (left channel) into the white AUDIO IN L socket (7) on the transmitter rear panel. 3. Connect the stereo mini jack plug on the connecting cable to the headphones output of your audio source (refer to fig. 6). 4. If the headphones output on your equipment is a 1/4 jack, plug the supplied mini jack to 1/4 adapter jack onto the connecting cable. Connect the adapter jack to the headphones output. 6.2.2 Connecting to a LINE or REC Output 1. Before connecting the transmitter to your audio source, switch the audio source OFF. 2. Referring to fig. 7, plug the red RCA connector (right channel) on the supplied connecting cable into the red LINE OUT R or REC OUT R socket and the white RCA connector (left channel) into the white LINE OUT L or REC OUT L socket on your audio source. 3. Connect the stereo mini jack plug on the connecting cable to the jack (7) on the transmitter rear panel (see fig. 8). 6.3 Charging the Batteries in the Headphones In order to ensure the longest possible service life for the rechargeable batteries, we deliver them uncharged. Therefore, charge the supplied batteries before first operating your headphone system. The supplied batteries have been inserted into the headphones for your convenience. WARNING: If you operate the headphones on dry batteries, never try to charge the batteries using the transmitters charging feature. This would cause irreparable damage to your headphone system. Dispose of spent batteries conforming to local waste disposal rules. 1. 2. Use the POWER switch (1) to switch the headphones off. When the power is off, the POWER LED (2) will be dark. Referring to fig. 11, place the headphones on the transmitter such that the charging pins (10) on the transmitter will engage the charging contacts (3) on the bottom of the lefthand earphone. 7
Connecting cable with stereo mini jack plug and L/R RCA plugs for connecting the transmitter to your audio source
Stereo mini jack to 1/4 adapter jack

AC adapter for powering the transmitter
Two 1.2 V AAA size NiCd rechargeable batteries for powering the headphones
If anything is missing, contact your AKG dealer immediately.

5 Controls

5.1 Headphones (Fig. 1) 1. 2. 3. 4. 5. 6. 5.2 7. 8. 9. 10. 11. POWER switch Green POWER indicator LED Charging contacts Battery compartment (beneath the ear pad) TUNING: frequency fine tuning control VOLUME control Transmitter (Fig. 2) AUDIO IN L/R, audio input sockets : DC 12 V: DC input jack for AC adapter FREQ. ADJUST: frequency tuning control Charging pins POWER ON/CHARGE: tri-color LED indicating charging and operating modes

6 Operating Notes

6.1 Connecting the Transmitter to AC Power 1. 2. Connect the cable on the supplied AC adapter to the DC 12 V jack (8) on the transmitter rear panel as shown in fig. 3. Check that the AC voltage stated on the AC

ENGLISH

T 305 UHF or T 405 UHF transmitter
The POWER ON/CHARGE LED (11) on the transmitter will light red to indicate that the batteries in the headphones are being charged. If signal is present at the transmitter audio input, the POWER ON/CHARGE-LED (11) will light orange. The batteries will be fully charged after approximately 7 hours. (The POWER ON/CHARGE LED (11) will continue lighting red.). You may leave the headphones on the transmitter for as long as you like without risking to overcharge the batteries. Important: In order to maintain full battery capacity for as long as possible, discharge the batteries completely about once a month: Switch the headphones on and leave them outside the transmitter until the POWER LED (2) extinguishes. Recharge the batteries as described above. 6.4 Replacing Batteries The capacity of any rechargeable battery will decrease over time. If you feel that you need to recharge the supplied batteries more often than would be convenient, you may consider replacing the batteries with new AAA size 1.2 V rechargeable or 1.5 V alkaline dry batteries. 1. 2. 3. Remove the ear pad from the left-hand earphone as shown in fig. 9. Remove the old batteries. Referring to fig. 10, insert the new batteries into the battery compartment (4). Make sure to align the batteries with the polarity marks inside the battery compartment. Replace the ear pad on the earphone aligning the four pins on the ear pad with the matching openings in the earphone base plate.

lighting orange:

is connected to AC and audio source and receives signal. Headphones are on the transmitter, charging function is on. has detected no signal for several minutes, headphones are on the transmitter, charging function is on. Transmitter. has detected no signal for several minutes, headphones are not on the transmitter, charging function is off, OR is not connected to AC power.

lighting red:

If LED is. dark:

7 Important Notes

1. Operating switches on or connecting the transmitter to your audio source may cause clicks which at high volume settings may affect your hearing. Therefore, be sure to set the VOLUME control on the headphones to minimum before switching between different sources (tuner, turntable, CD player, etc.) or connecting the transmitter. Listening over headphones at high volume levels, particularly over extended periods of time, may damage your hearing. Your K 305 UHF/K 405 UHF is a radio frequency device that conforms to the strict European standards. For physical reasons that have nothing to do with the quality of the product, extremely strong interference sources may affect reception. In order to maintain interference-free listening pleasure, do not operate your K 305 UHF/K 405 UHF in the close vicinity of radio equipment, cellular telephones, or directly above TV or computer monitor picture tubes. The supplied connecting cable is long enough to allow the transmitter to be placed at a safe distance from interference sources. Interference caused by other users of the 864/914 MHz LPD band are beyond AKGs control.
6.5 Setting Up the System Remove the headphones from the transmitter. Switch ON the audio source to which the transmitter is connected. If audio signal is present at the transmitter input, the POWER ON/CHARGE LED (11) on the transmitter will light green. Note: If no signal arrives at the transmitter input for a few minutes, the transmitter will automatically switch off and the POWER ON/CHARGE LED (11 will extinguish. 3. Use the POWER switch (1) to switch the headphones ON, so that the green POWER LED (2) will light. 4. Set the TUNING control (5) on the headphones such that you will hear the signal in the headphones clearly and free of interference. If the signal remains weak or noisy, use the FREQ. ADJUST control (9) on the transmitter to select a different carrier frequency and set the TUNING control (5) again as described above. 5. Set the VOLUME control (6) on the headphones to the desired volume level. 6.6 POWER ON/CHARGE LED Status If LED is. lighting green: Transmitter. is connected to AC power and audio source and receives signal. Headphones are not on the transmitter, charging function is off. 1. 2.

8 Specifications

System Performance Modulation: FM Carrier frequency: 864/914 MHz (LPD band) T 305 UHF/T 405 UHF Transmitter Power supply: 12 VDC, 200 mA Radiation angle: 360 Weight: approx. 9.2 oz. (260 g) Max. range: approx. 330 ft. (100 m) K 305 UHF Headphones Power supply: 3 VDC (2 x 1.2 V AAA size rechargeable batteries supplied) Battery life: approx. 10 hours (NiCd rechargeable batteries) Frequency range: 20 Hz to 22,000 Hz K 405 UHF Headphones Power supply: 3 VDC (2 x 1.2 V AAA size rechargeable batteries supplied) Battery life: approx. 20 hours (NiMh rechargeable batteries) Frequency range: 20 Hz to 24,000 Hz K 305 UHF/K 405 UHF Headphones Max. SPL: >110 dB SPL Weight: approx. 8.1 oz. (230 g) Distortion: <1% Type: semi-open dynamic headphones

9 Troubleshooting

Symptom No sound. 1. 2. 3. 4. 5. 6. 7. POWER ON/ CHARGE LED does not light. 1. 2. 3. Possible Cause AC adapter is not connected to transmitter and/or AC outlet. Transmitter is not connected to audio source. Connected audio source does not work. Volume control on audio source is at zero. Batteries are low. Headphones are switched off. VOLUME control on headphones is at zero. 1. 2. 3. 4. 5. 6. 7. Remedy Connect AC adapter to transmitter and/or AC outlet. Connect transmitter to audio source. Switch audio source on to feed signal to transmitter input. Set audio source volume to desired level. Charge batteries. Switch headphones on. Set VOLUME control to desired level. Connect transmitter to AC power. Check orientation of batteries in battery compartment. Place headphones on transmitter correctly.
Transmitter is not connected to AC power. 1. Batteries are not correctly aligned with polarity 2. marks. Headphones are incorrectly positioned on trans- 3. mitter. Connected audio source operates in mono mode. Transmitter is not correctly connected to audio source. Transmitter is set to the wrong carrier frequency. Frequency setting on headphones does not match transmitter carrier frequency. Audio level at transmitter input is too low. Input signal is noisy. Batteries are low. 1. 2.
Headphone sound is in mono.
Switch audio source to stereo mode. Check cable connection between transmitter and audio source. Use FREQ. ADJUST control to select different carrier frequency. Readjust TUNING control on headphones. Increase audio source volume. Check audio source. Charge batteries. Decrease audio source volume. Use FREQ. ADJUST control on transmitter to select carrier frequency and readjust TUNING control on headphones. Charge batteries.

Noise.

Distorted sound.
Audio level at transmitter input is too high. 1. Transmitter and headphones carrying frequencies 2. do not match exactly. Batteries are low. 3.

10 Warranty Conditions

AKG warrants AKG products against evident defects in material and workmanship for a period of one year from the date of original purchase for use. This Warranty does not cover damage resulting from misuse or abuse, or lack of reasonable care, or inadequate repairs performed by unauthorized service centers. Performance of repairs or replacements under this Warranty is subject to submission of the sales slip. Shipment of defective items for repair under this Warranty will be at the customers own risk and expense. This Warranty is valid for the original purchaser only. This Warranty does not cover dry or rechargeable batteries. Limited Warranty (valid in the United States only) AKG warrants AKG products against evident defects in material and workmanship for a period of one year and agrees to repair or, at our option, replace any defective unit without charge for either parts or labor. This Warranty does not cover dry or rechargeable batteries. Important: This Warranty does not cover damage resulting from accident, misuse or abuse, lack of reasonable care, the affixing of any attachment not provided with the product, loss of parts, or connecting the product to any but the specified receptacles. This Warranty is void unless service or repairs are performed by an authorized service center. No responsibility is assumed for any special, incidental, or consequential damage. However, the limitation of any right or remedy shall not be effective where such is prohibited or restricted by law. Simply take or ship your AKG products prepaid to our service department. Be sure to include your sales slip as proof of purchase date. (We will not repair transit damage under the no-charge terms of this Warranty.) Note: No other warranty, written or oral, is authorized by AKG Acoustics. This Warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Some states do not allow the exclusion or limitation of incidental or consequential damage or limitations on how long an implied warranty lasts, so the above exclusion and limitations may not apply to you.

Vol. 13 No.

61 4/2003
The Perfect Companion for a Jazz Favorite
Popular Jazz Artist Jane Monheit uses the C 900 to win over audiences worldwide

(see page 17)

PRODUCTS

Contents

Emotion/TriPower Series.2 TM40 Module..2 The WMS 4000..4 Wireless Harp with WMS40.7 Designer M.Schaefer..7

AWARDS

Soundcheck Award for WMS 40.7 "Goldenes Ohr":K 305 APCII.10 Audio Award for Hearo 777 Quadra and K 501..10 MIPA for D 440.14 Tastenwelt Award for D 880.20

INSTALLATIONS

CourtSmart..20
ARTISTS & ENDORSEMENTS
Lars Brogaard..15 Daniel Bradley..16 Jane Monheit..1, 17 Najee..18 AKG Artists..18 Steve Reid..19

INTERNATIONAL

MicCheck CD..18 NAMM 2003..20 Distributor of the Year..22 Musikmesse Frankfurt 2003..22

SCIENCE

AKG Cluster..8 Professional Headphones.10

Products

The Ingenious AKG Solution:

Module

Plug-in Module AKG TM40 Allows Wireless Or Hardwire Use
This is one of AKG's most ingenious ideas. Almost every user has a favorite microphone but most microphones are either hardwired or wireless. AKG decided to change that and help users save costs. n the D 3700M, D 880M, and C 900M microphones, all hot sellers worldwide, the XLR connector module can be easily replaced with the TM 40 transmitter module. The microphone thus becomes a slim, high-performance wireless microphone for use with the top quality AKG WMS 40 system. If a wireless microphone is less desirable or useful because it uses up batteries or the mic will be mounted on a stand (e.g. in a rehearsal room, studio, worship center, conference room, etc.) the TM 40 can be replaced with the XLR connector module in a few seconds. The new, innovative TM 40 plug-in transmitter module makes the new TriPower D 3700M as well as the best-selling Emotion Series D 880M and C 900 M even more versatile and flexible for an even wider range of applications. The TMS40 is an optional component.

As You Like It

New AKG Emotion/Tri-Power Series Microphones Featuring the unique TM40 Wireless Module Option
"Two-in one" philosophy redefined The New Standard: the most elegant wireless solution for hardwire microphones Attractive, ergonomic styling

The XLR module

The XLR module is also available separately, in three versions:
The latest microphones of the world-famous AKG Emotion/Tri-Power Series are a spectacular feat in terms of styling, features, versatility, and flexibility. The new line creates an optimized synthesis of hardwired and wireless technologies. Plug-in Module AKG TM40: Allows wireless or hardwire use
XLR module XLR module with on/off switch XLR module with integrated preamp

for C 900 M and C 5900 M

AKG Report

61/4-2003

The Tri-Power Series is back!

Some Tech Notes:

The AKG brand name stands for excellent engineering. Our technologies are optimized on an ongoing basis and are always state-of-the-art. The new microphone models use a newly designed shock mount that reduces handling noise even further than the previous version. Since AKG is famous for excellent sound, our designers made even more ambitious efforts to fine-tune the microphone's response. Although you are probably familiar with the Varimotion diaphragm technology, here's a little refresher course: AKG's Varimotion System diaphragm provides detailed reproduction of a wide frequency range at any sound pressure level. This has been achieved by a new deep drawing process producing a diaphragm of non-uniform thickness whose vibration behavior is different in the bass, mid, and treble ranges. This innovative technology also brings out all the detail of any sound, such as a guitar, voice, etc.

AKG D 880

AKG C 900

AKG D 3700

AKG D 3800

AKG C 5900

The D 3700M, D 3800M, and C 5900M provide new styling, sophisticated details, and unique engineering.
hese microphones originally became famous for their triangulated bodies. At first sight, the new shaft sections look circular. The microphone heads made of the same proven spring steel as the original Emotion Series top models are actually hemispherical so they can be screwed off easily. Even if it may not be obvious, the shafts do retain the triangulated shape for optimized ergonomics to ensure fatigue-free handling. The D 3800M dynamic and C 5900M condenser microphones offer the best of both worlds and define the new high-end class for the professional live sound market. The new Tri-Power C 5900M, D 3800M, and D 3700M microphone elements will be available for both the new WMS 4000 and WMS 80 handheld transmitters.
New C 900 M and D 880 M versions with plug-in module
AKG's international top sellers have been slightly modified. The XLR connector module can be removed and replaced with a TM 40 transmitter module for wireless use. The beauty of the system is that the microphone retains its absolutely convenient shape and size. No bulky "appendix" will ruin the elegance of the design. Vocalists will get a handy wireless microphone rather than the less handsome "clubs" of the past. The TM 40 is available as an option. The XLR module is also available separately, in three versions:
Saving space in the tour truck: the combined hardwire/wireless microphone - Wireless mics not bigger than theirs hardwire counterparts
D 3700M with innovative wireless solution
The resurrected D 3700 is highly flexible. It can be converted to wireless at any time simply by plugging in a TM 40 transmitter module without changing the microphone's chic appearance, shape, or size.
XLR module XLR module with on/off switch XLR module with integrated preamp for C 900 M and C 5900 M n

61/4-2003 AKG Report

The AKG WMS 4000:
The Ultimate Wireless System
A new era of wireless technology has just begun:

l l l l l l

AKG. The WMS 4000 sound is definitely not "wireless" but natural, powerful, and detailed! Discussions with users provided the basic input for the design of this system, particularly in terms of reliability, ease of use, and immunity to interference and intermodulation. The exceptional technology of the WMS 4000 is also reflected in its overall styling and workmanship. It appeals to the user with its esthetically pleasing shapes and colors; easy-to-use controls; clear, easy-to-read displays; and high quality all-metal cases with velvety soft-touch enamel finish.

HUB 4000 PC Network Concentrator and MCS 4000 Software Package
HUB 4000 HPA 4000 Headphone Amplifier
The HUB 4000 is a PC network concentrator for connecting up to eight SR 4000 receivers to an Ethernet network. Networks can be expanded as desired using standard computer peripherals such as Ethernet hubs or wireless LAN interfaces. Graphic scanner: Clear, easy-toread graphic representation of RF environment for optimal frequency setting. l System programming from a computer: Multichannel systems can be programmed in a series of easy steps. Frequency Presets can be updated through the Internet. Remote monitoring: A single screen shows all important parameters.

Automatic setup

Finding and setting the right frequencies for a multichannel system is a difficult and time-consuming job. The WMS 4000 provides several functions including AutoSetup and Environment Scan to speed up the process. The MCS 4000 from AKG is an incredibly convenient software tool. It scans the system's UHF band and uses an integrated frequency management database to calculate optimum frequencies. It automatically programs the frequencies into the receivers via the HUB 4000 to complete the setup. n
HUB 4000 Network Concentrator

BPU 4000 Battery Pack

CU 4000 Charger Unit MCS 4000 Mission Control Screen

AKG Report 61/4-2003

Products WMS 4000 Designer

First Wireless Harp

Richard Smith with his wireless harmonica Richard Smith used to be head of R&D designing gas and oil burners as well as running the training courses at engineering seminars. What started out as an interest has now taken over and, the design & manufacture of harmonicas is now what makes Richard tick. Alongside this activity he is also the UK distributor for other harmonica related products. As if that wasn`t enough, Richard is a serious a musician too. His band, "The Fat Marrow Blues Band" has featured in a documentary broadcast originally on BBC 2 Television and subsequently on digital TV in many countries around the world. Richard Smith came into contact with many different cultures early in his life. Due to his parents` job assignments, his family lived in various countries, he being born in Mombasa (Kenya). He learned to play several musical instruments although a long period alongside German folk music influenced his going down the harmonica route. So, it was inevitable that he would one day build an instrument of his own. "That was no big deal!!", Richard says with a wink. He began to think about a wireless harp a couple of years ago after spending time in the studio with Stevie Wonder. The electric harmonicas were a huge improvement on existing instruments but, Stevie`s blindness highlighted the fact that no cables at all would create the ideal instrument. The stars mentioned above will be the first to receive Richard's wireless harps when they come on stream later this year. We at AKG are very happy to contribute essential hardware components Richard Smith needs to complete his project. n Michael Schaefer, one of the leading Austrian product designers worked with his team on AKG's latest products: the WMS 4000 wireless microphone system and the Emotion/TriPower Series. "We regard market knowledge, technical possibilities and many years of experience in designing technical and consumer goods as vital tools in this process and combine them with an open mind and curiosity concerning the future." www.schaeferdesign.at n

Invented by Richard Smith, "Harmonix" Using AKG WMS 40 Components
p to now, harmonica players have found it difficult to hold both their instrument and a microphone at the same time. It has been difficult to keep the microphone from slipping and disturbing the cup they form with their hands to create specific sounds. The good news is that a new era for harmonica players has just begun. Richard Smith, who is based in Britain, has developed and patented the world`s first electric harmonica. Each harmonica has an inbuilt microphone, with a belt-mounted preamp giving the power needed. This immediately does away with the need to juggle an instrument and a traditional microphone at the same time. Showbiz greats such as Mick Jagger and Stevie Wonder have given the thumbs up to the product. The natural progression was to go wireless. The first test samples have performed extremely well and production models are eagerly awaited by the trade and stars alike. The product will be available this year under the "Harmonix" brand name.
"Soundcheck" Award for WMS40

The Technology

Having contacted several makers of wireless systems with little success, Richard contacted AKG Acoustics and found the ideal partner for his project. Product Manager Mario Siokola recommended WMS 40 microtools Series MP 40 micropen components and Richard built them into a harmonica. The only thing that gave away the modification to the harp was a small battery compartment on the rear however, production units will accommodate the battery internally. The wireless instrument provides a fantastic sound plus perfect mobility. The first model tested was a large 16 hole chromatic harmonica of the type commonly used by Stevie Wonder. Because of its size it has two omnidirectional 6-mm condenser microphone capsules installed at the rear of the instrument. Smaller chromatic and blues harmonicas will only require one microphone. The MP 40 transmitter chip is integrated into the harmonica body and the whole system is powered by a 1.5v battery inside the rear panel battery compartment.
Many, many thanks to the many, many readers of "Soundcheck" magazine, Germany, for choicing AKG WMS 40 MicroTools as "Wireless System of the Year 2003"! Another award for this outstanding system. Reader's of "Tastenwelt" magazine, Germany, recognized the WMS 40 in 2002 being the "Wireless System of the Year". The WMS40 MicroTools Series Micropen MP40 received an award in Belgium at the "Busworld Fair" as "Best Travelguide System", as well as a "Mercur" citation for innovation in Austria, end of 2002. n

Science

Great Choice!

The AKG Cluster

One of the largest computer clusters in Austria
AES, Journal of Audio Engineering Society, Vol.50, article seen in AES, Journal of Audio Engineering Society, Vol.50, No.12, page 1107 The WMS 4000 system was designed for 19 simultaneously operating wireless microphones. An 800 MHz PC takes three months to calculate 16 frequencies. Computing time for 19 frequencies is an estimated 390 years.

Our Approach

I suggested using parallel processing for the job and starting a project to create a program that would coordinate many levels of my program. Norbert Frese (Stefan Frese's son) realized my idea by designing a client-server solution for distributing a frequency calculation job to any desired number of computers within the company network. The server program assigns partial jobs and checks that they are completed. As of now, each PC in the AKG company network can be used provided the client program on it is started and the PC is not powered down any more. About 230 PCs are available at AKG. The client programs running on these computers day and night take lowest priority and will therefore interfere with nobody's dayto-day jobs. They communicate exclusively with the server program that runs on my PC, coordinates the clients, and saves the results.
AKG international REPORT no. 61
Published by: the International Press & Public Relations Office of AKG Acoustics GmbH, A Harman International Company A-1230 Vienna, Lemboeckgasse 21-25, Austria Phone: (++43-1) 866 54-1241 or 1421 Fax. (++43-1) 866 54-1205 Website: www.akg.com mail: e-press@akg.com Publishing Editor & documentations: Christina Burkhardt ("cb") press@akg.com Contributions: Richard Barnert, Ursula Hinkel, Wolfram Roch, Walter Rhrig, Mario Siokola, Richard Smith, Sarita Stewart Layout & Preepress: Agentur Feldmann A-1210 Vienna www.feldmann.net Photos: Jrgen Granser www.granser.com, AKG Staff Printed in Austria by Berger Druck, Horn AKG international REPORT is published by AKG Vienna for and on behalf of the AKG Family. It is distributed free of charge. Advertising on exchange only. This publication provides information and comments about AKG products and related topics. Opinions expressed are those of the author. This publication may not be reproduced or quoted in whole or part by printed or electronic means without prior permission of the publishers. Member of The Austrian Publishers Group Total circulation: 21,000 copies

by Wolfram Roch

The Problem
Optimum simultaneous operation of several wireless microphones requires carrier frequencies causing no or only minimal mutual interference. Stefan Frese, a consultant (a former RF engineer in R&D, AKG Vienna), first studied this matter in 1993 and wrote a program for calculating such frequencies. The number of alternatives that need to be checked being immense, the software and computing capacities available then were incapable of delivering results within a few days. Therefore, I wrote an optimized program for this job that obtained a solution for six microphones within about one minute. As the number of simultaneously operating wireless microphones and, consequently, the demand for interference-free (intermodulation-free) frequencies rose, the required computing time increased approximately 14fold every year. The WMS 4000 system was designed for 19 simultaneously operating wireless microphones. An 800 MHz PC takes three months to calculate 16 frequencies. Computing time for 19 frequencies is an estimated 390 years.

The Result

The latest ranking of the fastest computers in the world (http://www.top500.org/ list/2002/11) lists the "Schrdinger" cluster at the Technical University of Vienna as number 350 and the second fastest computer in Austria. It comprises 170 PCs of 1.7 GHz each, totaling 289 GHz. The total computing power of the AKG cluster is approximately 184 GHz, so although it is slower it is in the same category. A calculation of 17 frequencies has been completed already, a calculation of 18 frequencies is currently under way.

AKG International

Estimated computing times for some jobs

New AKG Catalogues

- Now Available!
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FULL LINE 2003

The Costs
Writing the management program took approximately 2 person months, operation only costs the electricity needed for keeping the PCs running during the nights and weekends.
way to obtain enough computing power to complete extremely complex frequency calculations efficiently and at low cost. The AKG cluster was first put to work for the new WMS 4000 wireless microphone system that offers users the convenience and reliability of what www.akg.com the only freis probably quency management system of its kind available today. n
Microphones Headphones Wireless Microphones Wireless Headphones Headsets Electroacoustical Components

AKG Acoustics GmbH

Lembckgasse 2125, P.O.B. 158, A-1230 Vienna/AUSTRIA, Tel: (+43 1) 86 654-0*, Fax: (+43 1) 86 654-7516, www.akg.com, e-mail: sales@akg.com
MICROPHONES HEADPHONES HEADSETS MODULAR MICROPHONE SYSTEMS WIRELESS MICROPHONE SYSTEMS SOUND PROCESSING SERIES CONFERENCE SYSTEMS MICROPHONE ACCESSORIES

Conclusion

Setting up the AKG cluster was a very easy
Bodenseestrae 228, D-81243 Mnchen/GERMANY, Tel: (+49 89) 87 16-0, Fax: (+49 89) 87 16-200, www.akg-acoustics.de, e-mail: info@akg-acoustics.de

AKG ACOUSTICS, U.S.

914 Airpark Center Drive, Nashville, TN 37217, U.S.A., Tel: (+1 615) 620-3800, Fax: (+1 615) 620-3875, www.akgusa.com, e-mail: akgusa@harman.com For other products and distributors worldwide see our website: www.akg.com
Specifications subject to change without notice. Printed in Austria. 02/03/PROA 1445
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PRO SOUND 2003

Intermediate status of 18-frequency calculation
AKG Acoustics GmbH AKG Acoustics GmbH AKG ACOUSTICS, U.S.

www.akg.com

RECORDING BROADCAST LIVE SOUND TOUR SOUND
0422_03_ KG_Emotion_gb 24.02.2003 15:11 Uhr Seite 3
Bodenseestrae 228, D-81243 Mnchen/GERMANY, Tel: (+49 89) 87 16-0, Fax: (+49 89) 87 16-200, www.akg-acoustics.de, e-mail: info@akg-acoustics.de 914 Airpark Center Drive, Nashville, TN 37217, U.S.A., Tel: (+1 615) 620-3800, Fax: (+1 615) 620-3875, www.akgusa.com, e-mail: akgusa@harman.com
For other products and distributors worldwide see our website: www.akg.com Specifications subject to change without notice. Printed in Austria. 02/03/PROA 1443

AKG.EMOTION

schaefer-design.at
EMOTION MICROPHONE SERIES

THE POWER OF EXPRESSION

Distributed Computing: Wolfram Roch, Head of Measurement & Automation, Production AKG Vienna, designed together with Norbert Frese a client-server solution

D 3700M + TM 40

D 3700M

D 3800M

C 5900M

C 900M

D 880M

D 660 S

TM 40 microtools

Awards, Awards, Awards.

"Goldenes Ohr" (Golden Ear) Award for AKG Headphones About 20,000 readers of the renowned German Magazine "Audio" cast their ballots in the "Best Headphones" poll. In the "wireless headphones category, the AKG K 305 AFC II finished in first place, elected by more than 31 % of all votes. The K 305 AFC II is a versatile system that is equally suited for all HiFi, TV, PC and multimedia applications. Thanks to its dynamic sound characteristics with strong bass emphasis, it has become one of the most popular wireless headphone systems. In the category cabled headphones the K 240 Studio received 20 % of the total votes, which made the second place in the ranking. Many thanks to all readers of AUDIO magazine for theirs choice! Gold Award for AKG Headphones Every year a panel of experts in Brazil awards the title of "E Os Vencedores So" for outstanding innovations in consumer and professional audio. In 2002 the panel elected two AKG products. The HEARO 777 Quadra has been elected as best of category wireless headphones. The K 501 received the Gold Award as best of category cabled headphones. We feel very honoured and thank the jury.

Old and New Dreams

The Key Element Is The Transducer
The transducer (a.k.a. speaker) is that part of the headphones that converts the electrical source signal into sound waves. Besides the electrostatic transducers that are a rather insignificant market segment, it is mainly electrodynamic transducers that have taken the lion's share of the market. In a dynamic speaker, the diaphragm that produces the sound is permanently fixed to a coil of wire. The coil sits inside the field of a permanent magnet. Following the law of induction, the coil starts moving up and down as soon as a current flows through it. Simple though it sounds, designing a dynamic transducer is hard work and in fact it takes a lot of experience to get a dynamic transducer ready for production. AKG has been one of the world's leading manufacturers of high quality transducers for years and one of the most innovative companies in the history of audio. More than 1400 patents granted in more than 50 years speak for themselves. The new generation of headphones required a new generation of transducers - giving birth to the XXL speaker! It should not be too surprising that the new speaker uses several proprietary innovations. see page 12

XXL exploded view

from page 11
Computer software normally used by vehicle manufacturers was used to study the vibration behavior of the diaphragm. These so-called FEM/BEM simulations break the diaphragm down mathematically into minute fractions to calculate its dynamic performance more accurately. FEM/BEM stands for Finite Element Method/Boundary Element Method. Since computers can make errors or input data may not be sufficient for meaningful calculations, AKG uses another high-tech tool to verify the simulation results in practice. The noncontact laser vibrometer scans the transducer vibrations and processes the data for further analysis within the computer. Together with listening tests with human subjects, laser vibrometry is the most important verification tool in designing electrodynamic transducers. For a detailed description of these tools see [M. Opitz/R. Barnert "Modern Development Tools for Dynamic Transducers", Proc. 111th AES Convention, 2001 Sept 21-24, New York, NY, USA]. Another essential design criterion for the XXL speaker was its ohmic impedance. Whereas the original AKG Monitor Series headphones had an impedance of 600 ohms, the impedance of the new-generation Studio models has been reduced to 55 ohms. The obvious result is a 12-dB increase in sensitivity. While high power headphone amplifiers hardly notice the difference, it does make a difference for mobile equipment. Portable mixers or minidisc players as well as the headphone outputs of standard hi-fi amplifiers can only drive low-impedance loads with maximum efficiency. The XXL speaker with its reduced impedance works perfectly with this kind of equipment.
The diaphragm, for instance, is made using the well-known Varimotion technology. A special deep-drawing technique shapes the diaphragm in such a way that it remains thicker in the center than in its peripheral area. The hard dome projects the high frequencies while the softer peripheral zone produces the low frequencies. The diaphragm material is a special plastic mixture whose mechanical impedance has been optimized to prevent unwanted vibration modes including wobbling. If the coil on the diaphragm does not move like a piston within the magnetic field but in any other way, the coil may graze against the magnet and cause unwanted distortion. By optimizing the mechanical impedance, the designer can eliminate this problem even for extremely large diaphragm excursions. This results in lower harmonic distortion, extended bass response, and higher maximum loudness. In developing the XXL speaker, AKG used the latest computer technology. The shapes of the magnetic field lines were calculated and optimized with software written by AKG engineers. The shape of the diaphragm is another essential element in designing the transducer's acoustic characteristics.

The new professional Studio Series headphones from AKG combine innovative Dr. Richard Barnert http://www.richardbarnert.com

MicCheck CD

The Easy Way To Choose The Right Microphone
AKG Acoustics has completed and is distributing Mic Check, a CD-ROM and audio CD that enables musicians, producers, engineers and retailers to compare and contrast AKG microphones with various features and prices. This free enhanced audio CD can be played in a standard CD player or as a CD-ROM and includes 89 dynamic tracks. AKG Acoustics U.S Marketing Manager, Sarita Stewart, states "Most microphone purchases are made without the benefit of a real demonstration. The main goal of this enhanced audio CD is to provide the reference points that are needed for the consumer to make a more informed and, ultimately, better purchasing decision. Listeners can hear for themselves the uncolored difference between microphones on many different instruments. Mic Check doesn't replace listening comparisons in a studio, but it is AKG's best attempt to bring the end user one step closer to that ideal." Mic Check is intended for distribution to serious musicians, studio owners, home recording enthusiasts, and is available directly from AKG and at the company's website, www.akgusa.com. The enhanced audio CD had been in the works for over nine months. Recording took place during three sessions at Masterlink Studios, Nashville, and in Chicago at both Pipertoonz and Perfect Sound Studios. In each case, multiple microphones were used to record professional musicians playing various instruments. Listening to each track in relation to one another will give the listener a chance to make an informed decision on the sound qualities of each microphone. "I have been using AKG microphones for decades," comments Nashville Producer Bill VornDick, "on all of my productions and recordings you will hear many of the microphones that were used on this CD. Everything was recorded flat, no compressors, no EQ; everything is 'natural.' Remember, a microphone and a mic pre-amp paint the audio picture. Each is different, and you can blend the two in different combinations to set hues, and timbres for recording instrument or voice." When Mic Check is played as a CD-ROM in computers, it will provide not only audio tracks but also commentary from the producers and engineers, as well as details on the AKG products used on each track. "We recognize that there are many variables when recording and that each instrument, musician, room and placement is unique," explains Stewart. "We've made no creative or technical decisions on the end users behalf. On some instruments, the end user may prefer a lower priced microphone to a studio standard, or a 1/2" condenser to a 1" large diaphragm. The idea is to give the listener a chance to make their own decision based on their own needs and based on what they are hearing." AKG Acoustics has completed and is distributing Mic Check, a CD-ROM and audio CD that will enable Musicians, Producers, Engineers and Dealers to compare and contrast AKG microphones with various features and prices. This free enhanced audio CD can be played in a standard CD player or as a CD-ROM and will include 89 dynamic tracks. Sarita Stewart, AKG Acoustics U.S Marketing Manager states. " see page 16

Kya baat

Daniel Bradley, master player of Indian music, discovered C 2000 B.
"Kya baat" is an expression of high appreciation you can hear in India that is roughly equivalent to "well played" or "gorgeous". Daniel Bradley definitely deserves this kind of praise as he thrills audiences both in India and worldwide with his authentic interpretations of Indian music. aniel Bradley was born in New York City and grew up in Colorado. He finished his studies in New Hampshire in 1968 and moved to Paris to study music with the grande dame of music, Nadia Boulanger. Nadia Boulanger was a close friend of Igor Strawinsky's and George Gershwin's composition teacher. Daniel came to Vienna in 1969 where he continued his musical studies in the vocal department. It was in the middle of the 1970s, Daniel said, that he found singing would not keep the pot boiling and when he first heard Indian music at the invitation of his friends he discovered his own soul in this form of music. Since 1976, he has been playing Indian music exclusively. He traveled to Calcutta regularly, took lessons with Nikhil Banerjee who died in 1986, and then continued his studies with Ali Akbar Khan, one of India's most famous musicians. During a concert tour in 1992, he came to Bombay where he was accepted as a student by Ali Akbar Khan's sister Annapurna Devi known as the greatest teacher in India. She taught him "dhrupad", an ancient style of music. "I feel privileged to study with her," said Daniel, "she only accepts very few students. She fundamentally changed my musical views." The main fascination of Indian music is its very structure that is basically a dialog between pure melody and rhythm. A few notes evoke and convey very strong emotions. "I feel at home within this structure," Daniel admitted. "It's free but strict and traditional all the same. There is no written music, only an oral tradition of melodic structures within which you can express your-
Bildtext zur Mikrofonierung z.B.: 2 AKG C 2000 in action
self through improvisation, interpretation, and composition." Every musician must make their own contribution, create something new, and develop their personal style. Indian music at its very best is a reflection of the musician's own personality in notes, so simple "cover versions" of a tune would be meaningless. "This is radical music. It is serious yet entertaining, although entertainment is not an end in itself," Daniel explained. "I always try to create something new without losing sight of the traditions. A master player of Indian music can move you to tears with a single note, it goes right to the heart. This is a great challenge." In his concerts, Daniel Bradley gives his audiences a very gentle introduction to Indian music. He prefers playing at relatively small venues because intimacy and nearness to the audience are very important. He begins his concerts on the sitar accompanied by tablas because playing together with this pair of drums is highly entertaining for the audience. Tabla expresses itself by a special percussion language with extremely sophisticated rhythmic structures. It offers an incredible gamut of sounds and highly developed sound structures. This part is a very entertaining dialog between the sitar and tablas, the leader and accompanist, melody and rhythm, characterized by long solos and mutual accompaniment. The middle part of the concert is a long solo on the surbahar, a lower-pitched instrument, in the extremely profound dhrupad vocal style. This is the time for the audience to get carried away by the timeless, meditative profundity of the music. According to Daniel, tabla evokes emotions in the guts but not in the heart. This can only be achieved by a melody instrument. Therefore, the tablas would be out of place during the surbahar performance. To finish the concert, Daniel plays the sitar again, accompanied by tablas, in a rather romantic, lightly classical vocal style. Sometimes they improvise over a Bengali folk tune.

Richard Barnert appeared with several different formations. He played his latest gig with the "Peter Natterer Quartett" at the "Porgy And Bess" jazz club in Vienna. His tour dates for 2003 include several concerts in Italy, Germany, Turkey, the US, and Austria.
"Najee is another artist who shows the diversity of AKG products," according to Sarita Stewart, AKG's Marketing Manager and Artist Relations Coordinator. "Musicians from all genres of musiccountry, jazz, rock, classical music and more-are using our products to project their percussion, fretted instruments, vocals, wind instruments and more. Najee is an excellent example of this diversity. We are delighted to have Najee endorsing AKG products." Jazz Legend Najee It is in a live setting where Najee's music and talents truly shine. On stage, Najee takes more risks and stretches out more, delving from straight ahead jazz to hard bop and back. The enormous talent expressed in his live playing has gained him the respect of his peers, and left the jazz world awed. n
Najee currently uses the WMS81/20, a WMS81 UHF Wireless System with C420 Headset for all of his live performances.

DREAM SCAPES

AKG ACOUSTICS HELPS BRING LIFE TO DREAM SCAPES
AKG partners with Steve Reid on his multimedia-rich, futuristic production. Dream Scapes is a stage performance that combines the best in visual, multimedia, and music, to take the audience on an optical and audible experience like no other. Written, composed, and directed by Grammy award winning and world-renowned percussionist and producer, Steve Reid, Dream Scapes began captivating audiences this past July and will continue until February 2003. When deciding on whom he would invite to sponsor the tour, Reid's initial choice was AKG. Enthusiastic to support this multi-sensory journey, AKG provided three WMS 81 wireless systems with C 420 headsets and six IVM1 in-ear systems to help raise the auditory element of this production to an even higher level. "AKG is a leader in our industry, and I wanted them on board with us for this extraordinary production," says Reid. "I wanted Dream Scapes to move the audience, to give them a visual and auditory experience like they'd never had. AKG was the obvious choice when considering how we wanted to monitor our sound." "The music of Dream Scapes is original and unparalleled," says Sarita Stewart, AKG Acoustics, U.S. Marketing Manager. "It combines the power of art and high technology with Cirque Du Soleil aerialists, exotic dancers, magical illusions, elaborate sets and the mind-expanding music of a Grammy nominated band. Steve Reid leads a talented force of musicians for this production, including flutist Will Donato, bass player Dig Lewis, guitarist Blake Aaron, keyboardist Hans Zirmuhlen, and percussionist Rojerio Jardim - this is the kind of work that AKG was made for. AKG is proud to support this auditory spectacular!" The WMS 81 wireless systems and IVM1 in-ear systems can provide a custom solution for almost any application. The WMS 81 system can use many channels simultaneously, has selectable frequencies, and interchangeable microphone elements. For interference-free reception, it also features digital, "Four Level Diversity" circuitry, and it comes with a wide range of accessories. The AKG IVM1 provides all the benefits of an IEM system, but dramatically improves the user's ability to hear the onstage mix with dimension. Its binaural processing is what allows the user to experience the live, on-stage feeling of conventional monitors while eliminating the negatives. Steve Reid has found that implementing the AKG WMS 81 wireless systems with the C 420 headsets and the IVM1 in-ear systems has been nothing short of a positive experience. "With these systems in the mix, we can hear how we really sound, without distortion. The sound that comes through the monitor is more natural than any I've experienced with other monitors. It makes a big difference during performance." n

AKG's Press Reception at the Winter NAMM 2003: launch of the new headphones K 171Studio and K 271Studio as well as the new PR40 miniature portable diversity receiver and the stationary four-level diversity receiver SR40
Sidebar Microphone the performance range such as how much gain can we use before feedback and how natural and intelligible is the audio." Treinis noted that one of the most important tests is the microphones ability to "withstand physical abuse. This is a courtroom setting where some people's basic nature is going to be to grab and twist things," he says. "So the microphones have to withstand that and still perform the way we want them to. The CK 80 that we use meets all that criteria." The CK 80 is a hypercardioid modular screwon capsule with smooth response from 50 Hz to 20 kHz. All Discreet Series capsules feature pre-polarized condenser elements with gold plated contacts to ensure reliable connections and trouble-free performance. The CK 80 capsule can be used with any of the Discreet Acoustics Modular Series installation modules. Each capsule is supplied with a W80 windscreen that reduces the impinging air stream. This reduction of air velocity reduces wind noise while maintaining acoustic transparency. In 1995 Treinis created CourtSmart's fault tolerant, database driven recording systems after he saw a need in the industry to provide quality, reliability and support for courtrooms, law enforcement agencies, government agencies and wherever verbatim records are required. With the implementation of the CourtSmart system, courts can now 'hear everything.' "The 'record' is sacrosanct-you cannot miss words or inflections," says Treinis. Paul Trepanier, A/V Manager of CourtSmart agrees, "Our systems allow us to tune a courtroom to its specific requirements for the recording and capturing of the record. Using the AKG CK 80, the speech is clear, intelligible and regardless of where a person speaks from in the room, audio will be picked up." Trepanier goes on to say, "AKG interchangeable modular capsules and goosenecks allow us to get the most out of each installation." With close to 1,000 courtrooms currently using CK 80 microphones (including the new Broward County, FL court complex which boasts 70 courtrooms and hundreds of AKG mics), Treinis also relies on AKG's support department, which includes NorEast Marketing. "We chose AKG as a companynot only because the product was good, but the support has been very good to us as well," states Treinis. "Often times we have rush requests where courtrooms need to be brought on line very quickly. AKG is very supportive in our requirements and have been able to deliver product where and when we need it on time. The product is reliable, we can rely on it and it's consistent. That's very important. We have the assurance that every AKG microphone we use performs." "CourtSmart is bringing to the forefront a major technological shift in the rapidly changing face of the court system," states Kevin Madden, AKG's Market Development Manager, Installed Sound. "AKG is pleased that our microphones are playing a part in that change. CourtSmart is a company with many years of experience in this very specialized field. They engineer all of their products and provide real solutions to law enforcement. The company also has some of the best software and hardware engineers that I have seen designing the CourtSmart applications. AKG looks forward to continuing in its long and healthy relationship with CourtSmart." CourtSmart Digital Systems is located at 51 Middlesex Street, N. Chelmsford, MA 01827; Tel: (800) 235-8690. For more information, please visit: www. courtsmart.com.

n 61/4-2003 AKG Report

Defense Desk

Witness Box

Events

All That Frankfurt

To cut a long story short, the show was a tremendous success for AKG! AKG Distributor of the Year 2002 Arbiter Pro Audio, UK, Max Lindsey-Johnson (r), Dr. Hugo Lenhard-Backhaus
ProLight + Sound music trade show in Frankfurt
he AKG booth was even more impressive and interesting than last year: congratulations to our Advertising department! The new products were real show stoppers; both the Emotion/Tri-Power Series including the TM 40 and the new WMS 4000 drew large crowds and were certainly among the highlights of the entire show. More than 80 international journalists attended our press conference where Lars Brogaard talked about his personal experiences with the new WMS 4000. Walter Rhrig presented the Emotion/Tri-Power Series and Mario Siokola the new WMS 4000.
Richard Smith chose our press conference as the venue for the first presentation worldwide of the first wireless harmonica and gave a musical demonstration. Thanks a lot to all those who found time for AKG in spite of their crammed agendas! We feel particularly indebted to Lars Brogaard for sacrificing one of his few days off to come to the AKG press conference all the way from London. Another highlight was the AKG Distributors' Meeting. Arbiter UK was honored as "Distributor of the Year 2002" for the highest increase in sales. Max Lindsey-Johnson accepted the award from Dr. Hugo LenhardBackhaus and specifically thanked his team for their excellent achievements.
Special Award" goes to AVC, Reinhard Mitter (l)
AVC-Team Croatia, Slovenia, Bosnia-Herzigovina, Yugoslavia
AKG Party: Brass Machine The German band "Brass Machine" fired the audience with hot rhythms and our in-house musicians rejoined as "AKG Experience" to put some AKG microphones to an endurance test. Christoph Schwald on keyboard, formerly R&D, now Consumer Product Marketing Manager, and Ken Morrison of Arbiter UK, a highly talented rapper, joined the original lineup with Richard Barnert on electric bass, Norbert Pawera on guitar, vocalist Norbert Perstinger, and Walter Rhrig on drums. Much of the organizational work was done by Garry Baumeister of AKG Munich who was kept from attending the show by a bad case of influenza. n
A Special Award was given to the Salzburgbased "AVC Group" with its manager Reinhard Mitter for its excellent performance in the emerging markets of Slovenia, BosniaHerzegovina, Croatia, and Yugoslavia in 2002 in spite of the difficult political and economic situations there. AVC impressively demonstrated the significance of these markets. At this point, we would like to thank all those who contributed to the overwhelming success of this trade show. We are also thank-