9A09572800

Dual Power Amplier

OWNERS MANUAL

Introduction

The TASCAM PA-30 is a high-performance professional audio power amplier for neareld studio monitoring and low-level sound reinforcement. In stereo mode, the PA-30 delivers 30 watts per channel continuously into an 8 ohm load - with no more than 0.05% total harmonic distortion. For applications requiring higher output power, the unit may be operated in BTL (Balanced Transformerless) mode also known as 'bridged' operation - and will deliver a full 60 watts continuously into 8 ohms (see the 'BTL Operation' section of this manual on page 9). In either mode, it exhibits a at frequency response characteristic from 20 Hz to 20 kllz (+0, 1dB), with very low residual hum and noise. For maximum exibility, the PA-30 is equipped with both XLR-type balanced and RCA-type unbalanced input connectors. These accommodate nominal input signal operating levels of +4 dBm and 10 dBV, respectively essentially eliminating the necessity for external compensating pads or gain stages. A single, continuously variable INPUT LEVEL control attenuates input signals so the unit's sensitivity can be calibrated to the gain structure of the source equipment. The PA-30 is designed and built to provide years of trouble-free service with little or no maintenance. Its well built power transformer easily handles continuous full-power operation, and all power semiconductor circuits are mounted on a large convection-cooled heatsink. Multiple resettable electronic protection circuits guard against destructive turn-on transients, output overload, DC offsets and output shorts. While the PA-30 is almost indestructible, it has been engineered to be easy to service. Like all TASCAM professional products, it is backed by a worldwide network of TASCAM dealers and TEAC authorized TASCAM service centers. Connection and operation of the PA-30 is simple and straightforward. This manual presents a detailed description of the unit's features, along with basic connection instructions and specications. Please take a few moments to study it before connecting and operating your PA-30 Power Amplier.

TABLE OF CONTENTS

Introduction... 2 Important Safety Instructions.. 3 Summary of Operating Precautions.. 4 Features... 5 Connection & Installation.. 7 BTL Operation.. 9 Specications.. 10
This appliance has a serial number located on the rear panel. Please record the model number and serial number and retain them for your records. Model number Serial number
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
The lightning ash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated dangerous voltage within the products enclosure that may be of sufcient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.
WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

TASCAM PA-30

IMPORTANT SAFETY INSTRUCTIONS
1) Read these instructions. 2) Keep these instructions. 3) Heed all warnings. 4) Follow all instructions. 5) Do not use this apparatus near water. 6) Clean only with dry cloth. 7) Do not block any ventilation openings. Install in accordance with the manufacturer's instructions. 8) Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including ampliers) that produce heat. 9) Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not t into your outlet, consult an electrician for replacement of the obsolete outlet. 10)Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. 11) Only use attachments/accessories specied by the manufacturer. 12) Use only with the cart, stand, tripod, bracket, or table specied by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. Do not expose this apparatus to drips or splashes. Do not place any objects lled with liquids, such as vases, on the apparatus. Do not install this apparatus in a conned space such as a book case or similar unit. The apparatus draws nominal non-operating power from the AC outlet with its POWER switch in the off position.

13) Unplug this apparatus during lightning storms or when unused for long periods of time. 14) Refer all servicing to qualied service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
Summary of Operating Precautions
Do not use the PA-30 if the power cord appears frayed or broken. Do not spill liquids into or on the PA-30 chassis. If the chassis becomes wet, allow it to dry thoroughly before reconnecting the unit. Allow sufcient space at the top, and bottom of the PA-30 to permit a ow of cooling air. Keep the unit away from radiators or others that produce heat. Never connect the PA-30 outputs to a battery, power supply or other voltage source. Do not short the output hot terminals together. The minimum allowable load impedance on each PA-30 output is 8 ohms in stereo mode or BTL mode. Connecting loads of lower impedance will result in current limiting and/or activation of the protection circuits. Before operating the PA-30, be certain that the MODE switch is set in accordance with the desired operational mode and output connection conguration (see the 'BTL Operation' section of this manual, page 9). Any unauthorized internal modication to the PA-30 will invalidate the warranty, and may result in hazardous conditions. Refer all servicing to a TEAC authorized TASCAM service center. Connect the PA-30 only to properly wired AC outlets. Make certain that the voltage is correct for the version of the unit that you are using (110 to 120 volts at 60 Hz for domestic USA). If an outlet appears to require repairs, consult a qualied electrician - and don't use it. An improperlywired outlet may present a serious shock hazard. For reference, Figure 1 shows the characteristics of a properly wired US standard three-prong wall outlet.

120 VAC

Neutral

Earth 0 ohms

0 Volts
Figure 1. Standard wall Receptacle

Voltage Conversion

Be sure to unplug the power cord from the AC outlet before repositioning the voltage converter switch. 1) Locate the voltage selector on the rear panel. 2) Using a at-bladed screwdriver, set to the appropriate 120 V or 230 V position according to your area.

AC Power Connection

The PA-30 requires a reliable source of single-phase power at 110 to 120 volts AC, 60 Hz (domestic US version). It has a two-prong, ungrounded AC cord, and may be connected to either two-prong or three-prong outlets. If you have any doubt about the wiring of the outlet that you wish to use, it is wise to test it before making connections. Simple plug-in testers are available from a variety of electronics and hardware stores.
Figure 2. Voltage Selector

Features

Figure 3. PA-30 FRONT PANEL
1. POWER Switch and Indicator
A two-position rocker-type switch controls power to the unit. Depressing the upper surface of the switch turns the amplier on; depressing the lower surface turns it off. The green LED Power indicator will light whenever the unit is on and is connected to a properly functioning source of power.
If the Protection indicator lights when the PA-30 is rst switched on, turn the Power switch OFF and recheck all of your connections before resetting power.

3. BTL Indicator

The orange LED BTL indicator will light whenever the MODE switch (on rear panel) is in the 'BTL (MONO)' position.

2. PROTECTION Indicator

The red LED Protection indicator remains off whenever the PA-30 is turned on and is operating normally. If an overload, short circuit, DC offset or other problem triggers the internal electronic protection circuitry, the unit shuts down and the Protection indicator lights. Once the PA-30 is turned off and the fault condition is cleared, the Protection circuit will automatically reset, and normal operation can be resumed (provided that the fault has not damaged the unit).

4. INPUT LEVEL Control

A single rotary variable attenuator sets the input sensitivity of the PA-30 Amplier. The degree of attenuation varies from zero loss (maximum sensitivity) at the 'MAX' position to innite loss at the 'MIN' position.

5. PHONES Jack

This Tip/Ring/Sleeve 1/4" phone jack accommodates 8 ohms or higher impedance stereo headphones.
Figure 4. PA-30 REAR PANEL
6. INPUTS (A & B, XLR & RCA Type)
Two input connectors are provided for each channel: one RCA (phono) jack and one XLR-type female connector. Either connector may be used on a given channel, but both connectors for a single channel should not be used simultaneously. Both inputs present a high impedance, and cause no appreciable loading to source outputs. Input sensitivity is 10 dBV (0.3 volt RMS) at the RCA inputs, and +1.3 dBu (0.9 volt RMS) at the XLR inputs, for rated output (with Input Level control at maximum). Pin assignments are as follows: XLR-type Pin I = common Pin 2= 'high'(+) Pin 3= 'Iow'() RCA-type Shell= common Tip = 'high'(+)

If the MODE switch is not correctly set, damage to the loudspeakers or to the PA-30 may result. For a complete explanation of use of the MODE switch, consult the section on 'BTL Operation' on page 9 of this manual.

8. SPEAKERS (A & B)

A pair of color-coded locking terminals is provided for output connections to each channel of the PA-30. They will accommodate stripped bare wire, or tinned wine ends. The minimum allowable load impedance for each output is 8 ohms.
The actual output connection conguration will vary depending upon the mode of operation selected and the number and type of loudspeakers used. Please refer to the sections on 'BTL Operation' and 'Output Connections' before making connections to the PA-30 outputs.
Virtually any line-level source may be connected to these inputs. (Refer to the 'Connection and Installation' section for further details.)

9. Mains Power Cord

The inlet for AC power to the PA-30 is a two-prong ungrounded plug (rear panel mounted). The PA-30 requires 120/230 volts AC at 50/60 Hz. It draws 8 watts at idle, and 130 watts at full rated output.

7. MODE switch

A single two-position slide switch (on rear panel) selects either monophonic BTL (Balanced Transformerless, also known as 'bridged', with switch set to BTL) or stereo operation (with switch set to STEREO).
Connection and Installation

Input Connections

Before making connections to the PA-30 signal inputs, nd the nominal output level of your signal source (this information is usually given in the Specications section of the instruction manual). Equipment operating at 10 dBV should be connected to the RCA (phono) inputs, while +4 dBm equipment will operate best if connected to the XLR-type inputs. (Low-level signal such as an electric guitar or phonograph cartridge will require an external preamplier.)

From Source Equipment

Components that operate at 10 dBV normally feature either RCA or 1/4-inch phone output connectors, presenting an unbalanced (two-connection) drive. Standard connecting cables and adapters may be used with such equipment. If you are making your own cables, refer to Figure 5 for wiring details.

To PA-30 RCA Input

Figure 5. Connections to the PA-dBV Input
Professional +4 dBm components, on the other hand, may feature either 1/4-inch phone or XLR-type output connectors, presenting either an unbalanced or a balanced drive. In some cases, standard microphone cables may be used for such equipment; in others, special cables or adapters may be required. Figure 6 shows the recommended wiring congurations for a few standard +4 dBm output types. Refer
to this gure when determining the types of cables and adapters to use in connecting to the PA-30 XLR inputs. Take care to observe the polarity conventions indicated; input polarity reversals may cause acoustical phase cancellation, resulting in unnatural sound.

To PA-30 XLR Input

Balanced
(Two-Conductor Shielded Cable)
Note: if source is pin 3 "hot" reverse pins 2 & 3

Unbalanced

Connect to pin 1 if required by source output
(Single-Conductor Shielded Cable)
Figure 6. Connections to the PA-30 +4 dBm Input

Output Connections

Each channel of the PA-30 will drive a minimum load impedance of 8 ohms. Connecting a load of lower impedance will result in current limiting and may trigger the Protection circuits to shut down the amplier. Figure 7 shows a normal stereo-mode connection of two individual speakers to the PA-30 outputs. When making loudspeaker connections, always be sure to maintain correct polarity; if you wire the speakers out of phase with one another, you will get acoustical phase cancellations. There are two basic methods for connecting multiple speakers to a single amplier output: series connection and parallel connection. Loudspeakers connected in series present a higher net impedance than any single unit alone. Parallel connection, by contrast, lowers the net load impedance. Sometimes, the two methods are combined to obtain an optimum load impedance. Figure 8 shows what happens to the net load impedance when multiple loudspeakers are connected in various ways. (In all cases, it is assumed that all speakers in a given system have the same impedance.) Generally, only parallel connection is used in professional audio, for two fundamental reasons. First, if one of the speakers in a parallel system fails, the others will still function. (Remember those old Christmas lights that all went out the minute one bulb failed? They were connected in series.) Second, parallel connection results in a lower net impedance. The closer the load impedance gets to the allowable minimum for the amplier, the more efciently is the amplier's power capability used, since the lower load impedance draws more current from the output stage.

Figure 7. Typical Stereo Output Connection
Each Unit 4 OHMS 8 OHMS 16 OHMS
Two In Series 8 OHMS 16 OHMS 32 OHMS
Three In Series 12 OHMS 24 OHMS 48 OHMS
Four In Series 16 OHMS 32 OHMS 64 OHMS
Two In Parallel (2 OHMS) (4 OHMS) 8 OHMS
Three In Parallel (1.33 OHMS) (2.66 OHMS) (5.33 OHMS)
Four In Parallel (1 OHM) (2 OHMS) (4 OHMS)
Four In Series/Parallel (4 OHMS) 8 OHMS 16 OHMS
Note: Impedances shown in brackets are too low for the amplifier. Do not use three loudspeaker configurations.
Figure 8. Connecting Multiple Loudspeakers

BTL operation

The PA-30 rear panel includes a switch that selects either normal stereo mode or a special mode termed BTL (Balanced Transformerless). The setting of this switch determines the maximum power available to the load from the PA-30, and also decisively affects how the load is connected to the amplier. This section explains the BTL mode, and describes how to use it. The voltage across the load is thus effectively doubled which doubles the power. Notice there is a crucial difference between BTL mode and what is normally termed 'mono' in the HiFi world. When we select 'mono' on a HiFi preamp or integrated amplier, what we intend - and what we get - is the same signal from both speakers with the same polarity. It is very important to understand the distinction between this and BTL mode, because if two speakers are connected to the PA-30 in a normal stereo conguration and the MODE switch is set to 'BTL', the system still works but the two speakers are out of phase. This will cause acoustical cancellations at low frequencies, resulting in poor sound quality. In rare cases, it can even cause a woofer to blow out!

Theory of Operation

BTL mode (also called 'bridged' mode) uses both channels of the PA-30 to form a single monophonic amplier with signicantly higher power capability. If your loudspeakers can handle the increased power, BTL mode will give you more headroom - resulting in undistorted reproduction of program peaks and signicantly greater 'punch' from your system. When the MODE switch is in the 'BTL (MONO)' position, only the Channel A input is active; the Channel B input is disabled, and signals present at either of the Channel B input connectors are ignored by the amplier. The signal at the Channel A input is amplied and sent to both outputs of the PA-30, but the

polarly of Channel B is reversed with respect to Channel A. In other words, the two channels are

Connections

Before changing the position of the MODE switch or making any input and output connections, turn OFF the PA-30. To select BTL operation, move the MODE switch to the 'BTL (MONO)' position. Figure 9 illustrates the connections for BTL mode. The input signal is connected to the Channel A input, using either the 10 dBV (RCA) or the +4 dBm (XLR) connector. The Channel B input is left unconnected. The load is connected across the two output 'hot' (red) terminals, and the black terminals are left unconnected. Be sure to observe correct output polarity: Channel A is positive, and Channel B is negative. Note that the minimum permissible load impedanoe in BTL mode is 8 ohms. Connecting loads with a lower impedance will result in current limiting, and may trigger the Protection circuits to shut down the amplier.
intentionally out of phase. The single load (remember, BTL is a monophonic, or single-channel, mode) is wired across the two channel output 'hot' (red) terminals, and the black output terminals are left unconnected. The minimum allowable load impedance is 8 ohms (not 4 ohms, as is the case in stereo mode), and the available power to the load is 50 watts continuous (at 8 ohms). BTL mode is electrically identical to push-pull transmission at line level (the signal level is simply much higher): the two channel outputs deliver the same absolute signal voltage, but with opposite polarities. So, when the Channel A output is at +10 volts, for example, the Channel B output is at 10 volts. The difference between the two (which is the total voltage across the load) is then 20 volts.
NO CONNECTION TO BLACK TERMINALS
Figure 9. BTL Mode Connection

Specications

Output power at 8 ohms, (1 kHz): 30 Watts minimum RMS per channel in stereo mode, both channels driven. (0.05% THD) 60 Watts minimum RMS in BTL (monophonic) mode. (0.08% THD) Total Harmonic Distortion (1 kHz): 0.05% (30 Watts 8 ohms, STEREO) 0.08% (60 Watts 8 ohm, BTL) Intermodulation Distortion: Less than 0.2%, 70Hz: 7kHz (4:1) Frequency Response: 20 Hz to 20 kHz, +0, 1 dB at rated power output. Damping Factor: 80 minimum, 8 ohm load. 20 Hz to 20 kHz. Input Impedance and SensItivity: 10dBV (0.3 volt RMS) for rated output, 15 kohm unbalanced at RCA input. +1.3 dBu (0.9 volts RMS) for rated output, 40 kohm balanced at XLR input. Hum and Noise: 85 dB below rated output. Minimum Load Impedance: 8 ohms per channel, stereo mode. 8 ohms, BTL mode. Protection Circuits: DC balance voltage protector; electronic output power overload protector Semiconductor Complement: 9 transistors, 8 diodes, 2 integrated circuits, 3 LEDs. Power Requimments: 120/230 volts, 50/60 Hz, AC switchable; 8 Watts at idle, 130 Watts at rated output. Weight: 4.5 kg net; 5.5 kg in shipping carton. Physical Dimensions: 2.1" (54 mm) high, 19" (482 mm) wide, 10.9" (276 mm) deep.

NOTES: Specifications subject to change without notice. 0 dBV is referenced to 1 volt RMS. 0 dBu is referenced to 0.775 volt RMS.

TEAC CORPORATION

Phone: (0422) 52-5082 3-7-3, Nakacho, Musashino-shi, Tokyo 180-8550, Japan 7733 Telegraph Road, Montebello, California Wallace Street, Mississauga, Ontario L4Z 1Z8, Canada Campesinos 184, Col. Granjes Esmeralda. CP 09810, Mexico DF 5 Marlin House, Croxley Business Park, Watford, Hertfordshire. WD1 8TE, U.K. Bahnstrasse 12, 65205 Wiesbaden-Erbenheim, Germany 17 Rue Alexis-de-Tocqueville, CE Antony Cedex, France Oeverkruid 15, NL-4941 VV Raamsdonksveer, Netherlands Oeverkruid 15, NL-4941 VV Raamsdonksveer, Netherlands 106 Bay Street, Port Melbourne, Victoria 3207, Australia Via C. Cant 11, 20092 Cinisello Balsamo, Milano, Italy

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Phone: (323) 726-0303

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Phone: 905-890-8008 Facsimile: 905-890-9888

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Phone: 5-851-5500

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Phone: 0611-71580

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Phone: 01.42.37.01.02

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TEAC AUSTRALIA PTY.,LTD. A.B.N. 408 462

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Phone: 02-66010500

DUAL POWER AMPLIFIER

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PA-150

PRELIMINARY

Front Panel-PA-150
Every personal, project or major recording studio needs power. And when it comes to monitoring signals from mixers, MIDI equipment and other gear, you need to power those nearfield or studio monitor speakers. Clean sound, space consciousness, high-performance and flexibility are your criteria. And thats exactly what makes the TASCAM PA-150 an ideal fit for personal and project studios or for major studios looking for a high-value power amp for a B suite or off-line editing room. With its dual power, switchable stereo/mono design, it excels in control room and recording studio applications whether powering single speakers, stereo pairs or bridged series. As with all TASCAM studio equipment, the PA-150 is built to last and will provide years of trouble free operations. With semiconductor circuitry, a convection-cooled heat sink and a rugged power transformer, the PA-150 delivers up to 150W per channel of pristine sound in a compact 2U, rack mountable design.
Balanced and Unbalanced Connections
You wont have to worry about using the PA-150 today or tomorrow. With both balanced and unbalanced connectors, it will easily integrate into any studio. The back panel inputs are optimized for +4 dBm and -10 dBV levels, minimizing gain staging to a single front panel sensitivity control. Also on the rear panel, is a stereo/BTL mode selector switch that enables you to take advantage of the PA-150s Dual Power Design. That means it can be used to pump out stereo or mono signals. Of course, solid speaker wire terminals are well labeled and make it easy to set up for bridged mono or stereo use. Setup is quick and simple.
You Need Power, Performance and Protection
The PA-150 sounds great and delivers 150W per channel at 4 ohms or 115W per channel at 8 ohms. And with an extremely flat frequency response of 20Hz-20kHz at less than.08% THD, it delivers a clean, transparent signal perfect for recording studio monitoring applications. And while the PA-150 packs enormous headroom, youll be pleased to know that it will warn you if your signals get too hot with its bright LED clip indicators for each channel. Stereo/BTL mode select switch Balanced and unbalanced inputs 150W per channel at 4 ohms 115W per channel at 8 ohms Accepts balanced XLR or 1/4" jacks Connect your speaker wires for stereo or bridged mono use Power indicator turns red whenever the PA-150 is protecting

SPECIFICATIONS

FRONT PANEL Power switch Volume control Power/Protect indicator Clip indicator REAR PANEL Speaker terminal Balanced input terminal Unbalanced input terminal Voltage selector switch Mode selector switch Cooling fan AC cord DIMENSIONS Seesaw Rotary x 2 (CH-A/CH-B) LED (green/red) LED (red) x 2 (CH-A/CH-B) (Screw x 2) x 2 (CH-A, CH-B) XLR x 2 (CH-A, CH-B) RCA (CH-A/CH-B) Slide (230V/115V) Slide (Stereo/BTL) DC brushless motor (12V) SPT-2, 2m W= 19 9/32"482mm (430mm, without front panel) H= 4 3/32" 102mm (88mm, without foot) D= 12 31/32" 324 (290mm, without knob and terminal) 20.9 lbs (9.5kg) Stereo = 4W MIN, BTL = 8W 650W Total Harmonic Distortion Stereo 20Hz, 1kHz 20kHz Stereo 20Hz, 1kHz 20kHz

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115W x 2 8W 0.06% 0.08% 0.6% 0.8% 150W x 2 4W 0.06% 0.08% 0.6% 0.8%
IMD (Volume: MAX) 60Hz:7kHz = 4:1 0.1% 0.2% 80W x 2, 8W Frequency Response (-3dB) (Volume: 1W Output/500mV Input) RCA Stereo 5Hz/100kHz 10Hz/80kHz BTL 5Hz/ 70kHz 10Hz/60kHz XLR Stereo 5Hz/ 40kHz 10Hz/30kHz BTL 5Hz/ 35kHz 10Hz/30kHz Input Sensitivity at Non-Clip (Volume: MAX) RCA Stereo(8W/4W) BTL XLR Stereo (8W/4W) BTL (8W) 1V 1V 0.1V 1V 1V 0.1V 1.6V 1.6V 0.1V 1.6V 1.6V 0.1V

NET WEIGHT OUTPUT LOAD Speaker output MIN MAXIMUM POWER CONSUMPTION AC POWER REQUIREMENT SAFETY REGULATION
230V/115V, 50Hz-60Hz (EX/T) 120V, 60Hz (T/C) LA (EX/T)NRTL/C or cUL(T/C)
Input Impedance (Volume: MAX) RCA 15k ohms XLR 30k ohms Crosstalk (-3dB from Non-Clip) (Volume: 1W Output/500mV Input) Input Open RCA 50dB 44dB XLR 50dB 44dB Specifications and features subject to change without notice or obligation.
ELECTRICAL SPECIFICATIONS Condition (EX/T, T/C) AC power line voltage Power line frequency 120V 60Hz
Output Power (Volume: MAX) Nominal Limit 20Hz-20kHz, 8W, 0.08% THD Stereo 105W x 2 100W x 2 20Hz-20kHz, 4W, 0.6% THD Stereo150W x 2 140W x 2 1kHz, 8W, 0.4% THD BTL 310W 300W
For more information about other TASCAM FAXBACK literature, call 1-800-827-2268.
1997 TEAC America, Inc. All rights reserved. 7733 Telegraph Road, Montebello, CA 90640 (213) 726-0303 TEAC Canada Ltd., 5939 Wallace Street, Mississauga, Ontario L4Z 1Z8 Canada (905) 890-8008 TEAC Mexico, S.A. de C.V., Priva de Colina #18, Colonia del Carmen, Coyoacan, Mexico, D.F. 04100 (525) 658-1943 FAXBACK Index# 9750 2/97