Part 2

Headphones Published 02/02

Headphones Pictograms

Frequency response The frequency response characterises the range of frequencies which a pair of headphones can reproduce. It is measured in hertz (Hz). The average human ear is capable of hearing frequencies ranging from about 20 Hz to 16,000 Hz. The frequency response alone does not reveal much about the reproduction quality.
Total harmonic distortion (THD) The THD represents the percentage of non-linear distortions of a signal, the so-called harmonics. These particularly occur at lower frequencies when the motion of the diaphragm cannot follow the electrical signal precisely.
Impedance Impedance is the headphones resistance to alternating current and is measured in ohms (). The impedances of Sennheiser headphones range from 16 to 600 ohms which means they can be connected to all standard hi-fi components.
Signal-to-noise ratio Difference between the wanted signal and the background noise of an electrically operated device (e.g. amplifier, microphone). Signal-to-noise ratio is measured in dB.

Weight

Connector

Cable length

Inputs

Power supply

Carrier frequency
Subject to alterations. Publ. 02/02

Headphones

1 Contents
Description of models... 3 How the electrodynamic transducer works.. 5 Connection cables.... 5 Description of models... 5 MX 300/MX 400/MX 500... 7 HD 26.... 8 PX 30..... 9 PX 40....10 HD 433.... 11 HD 437..... 12 HD 457..... 13 HD 477..... 14 HD 497..... 15 HD 500 Fusion.... 16 HD 570 Symphony.... 17 HD 580 Precision....18 HD 590 Prestige.... 19 HD 600 Avantgarde... 20 HD 25.... 21 HD 25 SP.... 22 HD 200 Master.... 23 HD 202....24 HD 212 Pro....25 HD 250 II Linear... 26 HD 265 Linear.... 27 HD 270 Control.... 28 HD 62 TV..... 29

Introduction Dynamic

Electrostatic
How electrostatic transducers work.. 31 Connection cable.... 31 Description of models.... 31 HE 90/HEV 90 Orpheus... 35

Cordless

IR and RF Headphones
How infra-red technology works.... 37 Description of models.... 37 IS 150 Mono.... 39 IS 300 Stereo.... 40 IS 380.... 41

Publ. 02/02

2 Contents
How radio frequency technology works... 43 Description of models.... 43 RS 30.... 45 RS 40.... 46 RS 45.... 47 RS 65.... 48 RS 85.... 49 RS 2400 Stereo.... 50

Wireless

RF Headphones

Headphones

with NoiseGard
How the NoiseGard active noise compensation system works.. 51 Description of models.... 51 HDC 451-1 NoiseGard mobile... 53 RI 150.... 56 RI 300.... 56 HDI 380.... 56 HDR 45-4.... 56 HDR 45-8.... 56 HDR 45-9.... 56 HDR 65-4.... 57 HDR 65-8.... 57 HDR 65-9.... 57 HDR 85-4.... 57 HDR 85-8.... 57 HDR 85-9.... 57 RR 2400.... 57
Active Noise Compensation

Supplementary

IR and RF

Accessories

HZR 62.... 58 Headphone Cable.... 58 BA 151..... 58 L 151-2..... 58 L 151-10.... 59 NT 92.... 59

Index

Models, Catalogue numbers... 61

Headphones Introduction

Sennheisers headphone range is comprised of four different types of headphones: Dynamic headphones Electrostatic headphones Cordless infra-red headphones Wireless radio frequency headphones

Description of models

HD. Dynamic headphones (Headphones, Dynamic) Sennheisers HD range of headphones are fitted with electrodynamic transducers. They are normally equipped with a 3.5 mm stereo jack plug and a 1/4 (6.3 mm) adaptor and can therefore be connected to all standard headphone outputs (amplifiers, CD players, DAT, DCC, MD, TV, personal stereos, camcorders etc.). Sennheisers range includes both open and closed headphones. Closed models provide better attenuation of surrounding noise, while open headphones give a more spacious sound. HDC. NoiseGard headphones (Headphones, Dynamic with noise Compensation) The HDC series of headphones are fitted with active noise compensation (NoiseGard) circuits which considerably reduce external low frequency noise. HDC 451-1 NoiseGard mobile HE. Electrostatic headphones (Headphones, Electrostatic) Sennheisers HE headphones are fitted with electrostatic transducers. Their operation requires a polarising voltage, so a special amplifier is needed to process the audio signal. IS. Cordless infra-red systems (Infra-red System) The IS series consists of complete systems of infra-red transmitters and headphones. It incorporates both traditional analogue and modern digital technology. HDI. RI. Dynamic infra-red headphones (Headphones, Dynamic, Infra-red) Infra-red stethoset receivers (Receiver, Infra-red) As only one infra-red transmitter is necessary to operate as many infra-red headphones as desired, Sennheiser offers supplementary headphones. Classic headphones are designated by the letters HDI, stethoset receivers by the letters RI. RS. Cordless radio frequency systems (Radio frequency System) The RS series consists of complete systems of RF transmitters and headphones with integrated RF receivers. HDR. RR. Dynamic radio frequency headphones (Headphones, Dynamic, RF) Radio frequency stethoset receivers (Receiver, RF) As RF transmitters can be used with any number of RF headphones, Sennheiser offers supplementary headphones. Classic headphones are designated by the letters HDR in their model number, RF stethoset receivers by the letters RR. RS 85 system with HDR 85 headphones HE 90/HEV 90

HD 590 Prestige

IS 380 system with HDI 380 headphones
Headphones Dynamic Headphones
How the electrodynamic transducer works
Dynamic headphones operate on the moving-coil principle. The headphones diaphragm is attached to a coil of wire held in suspension in the field of a permanent magnet. When an alternating current (i.e. the audio signal) passes through the coil, it generates a magnetic field. This coil field interacts with that of the permanent magnet and causes the coil (and thus the diaphragm) to move forwards and backwards depending on the direction of current flow. This vibration of the diaphragm produces pressure sound waves, i.e. the original audible audio information. The entire dynamic system needs to be as lightweight as possible in order to ensure a fast transient response. For this reason, Sennheiser use coils made from aluminium copper or even pure aluminium in their high-quality headphones.

Connection cables

All dynamic headphones (with the exception of the HD 25 and HD 25 SP) are supplied with oxygen-free copper cables.
HD. HD headphones are equipped with dynamic transducers.

Cat. No.

6 Overview

Brief Description

Open dynamic stereo in-ear headphones Open dynamic stereo in-ear headphones Open dynamic stereo in-ear headphones Open dynamic stereo mini headphones offener dynamischer Stereo-Mini-Kopfhrer offener dynamischer Stereo-Mini-Kopfhrer offener dynamischer Stereo-Kopfhrer offener dynamischer Stereo-Kopfhrer offener dynamischer Stereo-Kopfhrer offener dynamischer Stereo-Kopfhrer offener dynamischer Stereo-Kopfhrer Open dynamic stereo headphones Open dynamic stereo headphones Open dynamic stereo headphones Open dynamic stereo headphones Open dynamic stereo headphones Closed dynamic stereo headphones Closed dynamic stereo headphones Closed dynamic stereo headphones geschlossener dynamischer Stereo-Kopfhrer geschlossener dynamischer Stereo-Kopfhrer Closed dynamic stereo headphones Closed dynamic stereo headphones Closed dynamic stereo headphones Open stereo TV headphones with volume control and long cable
MX 300 MX 400 MX 500 HD 26 PX 30 PX 40 HD 433 HD 437 HD 457 HD 477 HD 497 HD 500 Fusion HD 570 Symphony HD 580 Precision HD 590 Prestige HD 600 Avantgarde HD 25 HD 25 SP HD 200 Master HD 202 HD 212 Pro HD 250 II Linear HD 265 Linear HD 270 Control HD 62 TV Stereo

Variants

HD 25-13 HD 25 SP-1

7 MX 300/MX 400/MX 500

Cat. No. 04418 MX 300 Cat. No. 04419 MX 400 Cat. No. 04420 MX 500
The MX 300, MX 400 and MX 500 are stereo in-ear headphones for listening on the move. Very lightweight and comfortable. Features Wide dynamic range Excellent bass response Dual-sided highly conductive OFC copper cable Can be connected directly to personal stereos, CD players, DAT recorders and hi-fi systems In-ear headphones come with a practical case with an automatic cord take-up mechanism (MX 400 and MX 500 only) Additional volume control (MX 500 only) Colours: MX 300: black MX 400: black and silver MX 500: blue metallic

12-38,000 Hz

< 0.1 %
Ear pads (1 pair) Cat. No. 50635
The audiophile-quality HD 590 Prestige open circumaural headphones ensure unadulterated listening pleasure with outstanding clarity. Selected materials and the computer-optimised design make these headphones exceptionally comfortable to wear. Features Top-of-the-range high-definition open-back hi-fi stereo headphones Superbly natural sound reproduction and better localisation of sounds due to new transducer orientation (patent pending) Large-surface Duofol diaphragms eliminate standing waves in the capsule Extremely lightweight 18-mm aluminium voice coils for fast transient response with excellent linearity, suitable for professional monitoring New Sennheiser patented damping element for controlling diaphragm oscillation Computer-optimised neodymium ferrous magnet systems minimise harmonic distortion Detachable, single-sided connection cable made from Kevlar-reinforced, highly conductive OFC copper

19 HD 590 Prestige

Cat. No. 04590 Cat. No. 04591 Cat. No. 04486
Frequency response Transducer principle Frequency characteristic Impedance Characteristic SPL THD Ear coupling Contact pressure Weight (without cable) Connector 12 38,000 Hz dynamic, open diffuse field equalised dB at 1 kHz, 1 mW < 0.1 % at 1 kHz, 110 dB SPL circumaural approx. 2.5 N approx. 270 g 3.5 mm stereo mini jack plug with adaptor to 1/4 (6.3 mm) stereo jack plug 3 m, detachable single-sided OFC copper cable
Ear pads (1 pair) Connection cable Cat. No. 77906 Cat. No. 73469

20 HD 600 Avantgarde

Cat. No. 04465
The HD 600 Avantgarde are audiophile-quality, open dynamic hi-fi/professional stereo headphones. The advanced diaphragm design eliminates standing waves in the diaphragm material. The HD 600 can be connected directly to hi-fi systems of the highest quality, in particular DAT, DVD, MD and CD players. These headphones are an ideal choice for the professional recording engineer recording classical music. Features Sophisticated design, elegantly finished in black and grey High-quality, open metal mesh earpiece covers for an extremely transparent sound Computer-optimised magnet systems minimise harmonic and intermodulation distortion Extremely lightweight aluminium voice coils ensure excellent transient response Neodymium ferrous magnet systems for optimum sensitivity and a wide dynamic range Exceptionally natural, spatial and accurate sound Detachable OFC copper cable, Kevlar-reinforced, with very low handling noise

HD 25-13 as HD 25, but 600 version with 3 m cable terminating in a 1/4 (6.3 mm) stereo jack plug Cat. No. 03353
The HD 25 SP are closed dynamic headphones for monitoring, recording and outdoor applications. They are a lower-cost alternative to the HD 25, featuring a simpler headband and a slightly different capsule design. Features Very lightweight, comfortable even if used for long periods Effective attenuation of background noise minimises risk of feedback High maximum sound pressure level 85 nominal impedance ensures universal compatibility Tough, detachable stranded steel cable Neodymium ferrous magnet systems and lightweight aluminium/copper voice coils for fast transient response

22 HD 25 SP

Cat. No. 03759
Frequency response Transducer principle Nominal impedance Characteristic SPL at 1 kHz Load rating THD Ear coupling Contact pressure Weight (without cable) Connector Connection cable 30 16,000 Hz 3 dB dynamic, closed dB 2 dB 0.2 W < 0.4 % supra-aural approx. 3 N 115 g 1/ (6.3 mm) 4 stereo jack 3 m, detachable dual-sided steel cable
30-16,000 Hz 85 < 0.4 % 115 g 6.3 mm steel 3m
Stereo volume control HZR 62 (for HD 25 SP-1 only) Cat. No. 05248
Closed dynamic headphones for monitoring in noisy environments, high sensitivity, sound pressure level 100 dB. Frequency response 30 Hz to 16 kHz, THD
< 0.4 %, nominal impedance 85 , load rating 0.2 W.
3 m steel cable with 1/4 (6.3 mm) stereo jack plug.
Ear pads (1 pair) Velour ear pads (optional) (1 pair) Cat. No. 40179 Cat. No. 69417
HD 25 SP-1 as HD 25 SP, but with 3.5 mm / 1/4 stereo jack and 65 nominal impedance Cat. No. 04173
The HD 200 Master is a pair of closed circumaural stereo headphones with powerful dynamics. Due to their high attenuation of background noise, these headphones are ideal for DJ monitoring. A lightweight construction and new ergonomic design ensure excellent comfort for long hours of listening. The singlesided, Kevlar-reinforced, highly conductive OFC copper cable can easily be replaced. Features Closed circumaural stereo headphones Very lightweight, comfortable even if used for long periods Ideal for DJ monitoring Very comfortable to wear due to BioNetic design Effective attenuation of ambient noise minimises risk of feedback High maximum sound pressure level Neodymium ferrous magnet systems for optimum audio performance Replaceable parts for long life

23 HD 200 Master

Cat. No. 04592 Cat. No. 04593 Cat. No. 04478

Frequency response Transducer principle Frequency characteristic Impedance Characteristic SPL THD Ear coupling Contact pressure Weight (without cable) Connector 12 22,000 Hz dynamic, closed diffuse field equalised dB at 1 kHz, 1 Vrms < 0.3 % at 1 kHz circumaural approx. 5 N approx. 140 g 3.5 mm stereo mini jack plug with adaptor to 1/4 (6.3 mm) stereo jack plug 3 m, detachable single-sided OFC copper cable

12-22,000 Hz

Ear pads (1 pair) Connection cable Cat. No. 77905 Cat. No. 73469
The HD 202 closed, dynamic hi-fi stereo headphones are the ideal partner for DJs and powerful modern music, providing good insulation against ambient noise and a vivid, crisp bass response. The rugged lightweight headphones have a secure fit and can be used for both mobile sources and home (mini) hi-fi systems. When out and about, a convenient cord take-up lets you adjust the headphone cable to the required length. Features Closed, supra-aural, dynamic hi-fi stereo headphones For DJs, ideal for both mobile sources and home mini hi-fi systems Good attenuation of ambient noise Earcups can be removed from the headband Specially designed damping perforation ensures powerful bass response Lightweight diaphragm material with turbine embossing for extremely low bass Powerful neodymium magnets and lightweight diaphragms for high sound levels Powerful bass and increased signal levels for modern rhythm-driven music Clips to the belt: cord take-up for adjusting the cable length when listening on the move Extremely comfortable to wear due to ultra-lightweight design, even for extended listening Rugged outdoor design with extremely flexible headband 3m highly conductive OFC copper cable Replaceable leatherette ear pads 2-year guarantee

24 HD 202

Cat. No. 05176
Frequency response Transducer principle Nominal impedance Characteristic SPL at 1 kHz THD Ear coupling Weight (without cable) Connector Connection cable 1818,000 Hz dynamic, closed dB < 0.5 % supra-aural ca. 130 g 3.5/6.3 mm stereo jack plug 3m

18-18,000 Hz

Cat. No. 85709
The HD 212 Pro closed dynamic hi-fi stereo headphones have a balanced sound image with a slight emphasis on the bass response. DJs will like their excellent attenuation of ambient noise and the soft, comfortable ear pads. Features Closed, supra-aural, dynamic hi-fi stereo headphones Ideal for DJs Good attenuation of ambient noise Earcups can be removed from the headband Specially designed damping perforation ensures powerful bass response Lightweight diaphragm material with turbine embossing for extremely low bass Extra-thin diaphragm for precise trebles Well defined mid-band and spatial sound reproduction due to foam damping element High levels and powerful bass for modern rhythm-driven music Extremely comfortable to wear due to ultra-lightweight design, even for extended listening 3m detachable highly conductive OFC copper cable Replaceable leatherette ear pads 2-year guarantee

25 HD 212 Pro

Cat. No. 05180
Frequency response Nominal impedance Characteristic SPL at 1 kHz THD Ear coupling Connection cable Transducer principle Weight (without cable) Connector 1219,000 Hz dB < 0.2 % supra-aural 3m dynamic, closed ca. 130 g 3.5/6.3 mm stereo jack plug

12-19,00 Hz

< 0.2%
Ear pads (1 pair) Connection cable Cat. No. 85709 Cat. No. 83380
The HD 250 II Linear are closed dynamic hi-fi stereo headphones with the feel of an open design. They are an ideal choice not only for professional monitoring and live sound recording, but also for use with high-end hi-fi systems where they ensure undisturbed enjoyment of music. Features Precise sound reproduction with wide dynamics Extremely lightweight aluminium voice coils ensure an excellent transient response Neodymium ferrous magnet systems for optimum sensitivity Diffuse field equalised for unadulterated listening Detachable OFC copper cable, very low handling noise

26 HD 250 II Linear

Cat. No. 04393
Frequency response 5 40,000 Hz 10 dB 10 25,000 Hz 3 dB Transducer principle dynamic, closed Frequency characteristic diffuse field equalised Nominal impedance 300 Characteristic SPL at 1 kHz 94 dB Load rating 200 mW THD < 0.2 % Ear coupling circumaural Contact pressure 3N Weight (without cable) 215 g Connector 3.5 mm stereo mini jack plug with adaptor to 1/4 (6.3 mm) stereo jack plug Connection cable 3 m, detachable dual-sided OFC copper cable

10-25,000 Hz

Ear pads (1 pair) Cat. No. 34183
The HD 265 Linear are closed dynamic stereo headphones which also satisfy professional demands. They are equally suitable for professional monitoring and for use with hi-fi systems where they ensure undisturbed enjoyment of music and fine reproduction of detail. Features Extremely lightweight aluminium voice coils for an excellent transient response Neodymium ferrous magnet systems ensure optimum sensitivity Diffuse field equalised for unadulterated listening Ergonomic design Detachable OFC copper cable, very low handling noise

27 HD 265 Linear

Cat. No. 04196
Frequency response Transducer principle Frequency characteristic Nominal impedance Characteristic SPL at 1 kHz Load rating THD Ear coupling Contact pressure Weight (without cable) Connector 10 25,000 Hz dynamic, closed diffuse field equalised dB 200 mW < 0.15 % circumaural 3N 215 g 3.5 mm stereo mini jack plug with adaptor to 1/4 (6.3 mm) stereo jack plug 3 m, detachable dual-sided OFC copper cable

IS. Complete systems consisting of infra-red transmitters and headphones can be identified by the inclusion of the letters IS in their model number. Supplementary IR headphones are designated by the letters HDI in their model number. Supplementary IR stethoset receivers are designated by the letters RI in their model number.

38 Overview

IS 150-120 IS 150-UK

IS 150 Mono

Stethoset system, consisting of infra-red transmitter and mono stethoset receiver

IS 300 Stereo

Stethoset system, consisting of infra-red transmitter and stereo stethoset receiver IS 300-120 IS 300-UK 40

IS 380

Headphone system, consisting of infra-red transmitter and hi-fi stereo headphones IS 380-120 IS 380-UK 41
The IS 150 Mono system consists of the TI 150 infra-red transmitter and the RI 150 infra-red mono stethoset receiver and can be connected directly to television sets fitted with a headphone jack socket. The stethoset headphones feature an on/off/volume control. One transmitter can supply several RI 150 stethoset receivers. Features Very easy to use Excellent speech intelligibility, good music reproduction Transmitter with radiating power for rooms of up to 60 m2 Excellent transmission reliability due to new carrier frequency (2.3 MHz) Receiver powered by environmentally friendly NiMH rechargeable accupack Transmitter can charge two accupacks at the same time Lightweight receiver (45 g incl. accupack), very comfortable to wear Delivery includes: 1 RI 150 mono stethoset receiver, 1 BA 151 accupack, 1 TI 150 transmitter, 1 plug-in mains unit, 1 spare set of ear-cushions, 1 AF connection cable with 3.5 mm/1/4 jack plug

39 IS 150 Mono

Cat. No. 04379
Technical Data RI 150 Stethoset Receiver
Modulation Receiving frequency Frequency response THD Signal-to-noise ratio Max. SPL Operating time Weight (incl. accupack) Dimensions FM, mono 2.3 MHz 18 18,000 Hz
typ. 70 dB approx. 110 dB approx. 6 h per accupack 45 g 137 x 188 x 20 mm
Technical Data TI 150 Transmitter
Modulation Carrier frequency Frequency response THD Signal-to-noise ratio FM, mono 2.3 MHz 18 18,000 Hz <1% typ. 70 dB 7 VA via plug-in mains unit NG 12-DC NG 12-120 NG 12-UK 3.5 mm jack plug with adaptor to 1/4 (6.3 mm) jack plug approx. 170 g 135 x 35 x 88 mm 205 mm

RI 150

TI 150

2.3 MHz

Accupack Suppl. stethoset receiver Replacement ear-cushions Replacement ear-cushions BA 151 RI 150 EP 1 (black, firmer version, 4 pieces) EP 2 (transp., softer version, 4 pieces) Cat. No. 04146 Cat. No. 04383 Cat. No. 04655 Cat. No. 04656
Power consumption Power supply European version USA version UK version Connector

Weight Dimensions Total height (transmitter with receiver)
Replacement ear-cushions, black (firmer version) Replacement ear-cushions, transparent (softer version) Adaptor cable for connection to SCART socket Cat. No. 37080 Cat. No. 40949 Cat. No. 47874
IS 150-120 IS 150-UK as IS 150, but with USA plug-in mains unit and AF connection cable with RCA phono connector Cat. No. 04380 as IS 150, but with UK plug-in mains unit Cat. No. 04381
The IS 300 Stereo system consists of the TI 300 infra-red transmitter and the RI 300 infra-red stereo stethoset receiver. It can be connected directly to television sets and hi-fi systems via the headphone jack socket. The stethoset headphones feature an on/off/volume control. One transmitter can supply several RI 300 stethoset receivers. Features Very easy to use Excellent speech intelligibility, good music reproduction Transmitter with radiating power for rooms of up to 60 m2 Excellent transmission reliability due to new carrier frequencies (2.3/2.8 MHz) Receiver powered by environmentally friendly NiMH rechargeable accupack Transmitter can charge two accupacks at the same time Lightweight receiver (45 g incl. accupack), very comfortable to wear Delivery includes: 1 RI 300 stereo stethoset receiver, 1 BA 151 accupack, 1 TI 300 transmitter, 1 plug-in mains unit, 1 spare set of ear-cushions, 1 AF connection cable w. 3.5 mm/1/4 jack plug

40 IS 300 Stereo

Cat. No. 04150
Technical Data RI 300 Stethoset Receiver
Modulation Receiving frequencies Frequency response THD Signal-to-noise ratio Max. SPL Operating time Weight (incl. accupack) Dimensions FM, stereo 2.3/2.8 MHz 18 18,000 Hz
typ. 64 dB approx. 110 dB approx. 5 h per accupack 45 g 137 x 188 x 20 mm
Technical Data TI 300 Transmitter
Modulation Carrier frequencies Frequency response THD Signal-to-noise ratio FM, stereo 2.3/2.8 MHz 18 18,000 Hz <1% typ. 64 dB 10 VA via plug-in mains unit NG 20 NT 20-120 NT 20-UK 3.5 mm jack plug with adaptor to 1/4 (6.3 mm) jack plug approx. 180 g 135 x 35 x 88 mm 205 mm

RI 300

TI 300
18-18,000 Hz 2.3/2.8 MHz 3.5/6.3 mm
Accupack Suppl. stethoset receiver Replacement ear-cushions Replacement ear-cushions BA 151 RI 300 EP 1 (black, firmer version, 4 pieces) EP 2 (transp., softer version, 4 pieces) Cat. No. 04146 Cat. No. 04378 Cat. No. 04655 Cat. No. 04656
IS 300-120 IS 300-UK as IS 300, but with USA plug-in mains unit and AF connection cable with RCA phono connector Cat. No. 04151 as IS 300, but with UK plug-in mains unit Cat. No. 04152
The IS 380 system consists of the TI 380 infra-red transmitter and HDI 380 hi-fi stereo headphones. High sound quality is matched by excellent comfort for the wearer and modern styling. The transmitter can be connected to the headphone socket of any sound source. Features Headphones extremely comfortable to wear Can be connected to televisions, hi-fi systems, CD players and DAT or MD recorders High sound quality Delivery includes: 1 pair of HDI 380 headphones, 1 BA 151 accupack, 1 TI 380 transmitter, 1 plug-in mains unit, 1 AF connection cable with 3.5 mm/1/4 jack plug

47 RS 45

Cat. No. 04948 RS 45-4 (434 MHz) Cat. No. 04949 RS 45-8 (863 MHz) Cat. No. 04951 RS 45-9 (925 MHz)
Technical Data HDR 45 Headphone Receiver
Technical Data T 45 Transmitter
RS 45-8 UK 863 MHz variant with UK plug-in mains unit Cat. No. 04950
The RS 65 wireless RF headphone system with open, circumaural headphones features an integrated, switchable SRS processor for impressive surround sound. The system has very transparent and balanced sound reproduction. The RS 65 comes equipped with Center-LockTM Auto-Tuning. A simple touch of a button, and the headphones will automtically adjust to the transmitter (and can simply be returned with a second touch if it locks on to your neighbours transmitter). Features SRS processor delivers amazing surround sound Headphones incorporate volume control and one-touch auto-tuning Reception through walls and ceilings, in the home and outside in the garden within a range of up to approx. 100 m (30 m for 925 MHz variant) Three switchable channels (2 for 863 MHz variant) Headphones feature SAW input filter to eliminate RF interference Supplied with second accupack Special audio filter in the transmitter eliminates TV interference Very lightweight and comfortable headphones with soft, velvet-like earpads

48 RS 65

Cat. No. 04952 RS 65-4 (434 MHz) Cat. No. 04953 RS 65-8 (863 MHz) Cat. No. 04955 RS 65-9 (925 MHz)
Technical Data HDR 65 Headphone Receiver
Transducer principle Frequency response THD Max. SPL Power supply Operating time Weight (with BA 151)
is a trademark of SRS Labs, Inc.
dynamic, open 2020,000 Hz < 0.5 % 100 dB via BA 151 accupack, 2.4 V over 4 h per accupack approx. 160 g
Technical Data T 65 Transmitter
Carrier frequencies 434 MHz variant: 434.15 MHz, 433.4 MHz, 434.5 MHz (switchable) 836 MHz variant: 863.25 MHz, 863.75 MHz (switchable) 925 MHz variant: 925.0 MHz, 926.0 MHz, 926.5 MHz (switchable) up to approx. 100 m (up to approx. 30 m for 925 MHz variant) FM stereo typ. > 68 dBA 3.5 mm stereo jack plug with adaptor to 1/4 (6.3 mm) stereo jack plug (925 MHz variant with adaptor to RCA phono connectors) 2, for headphones plus second BA 151 approx. 186 g 155 x 153 x 105 mm

SCART adaptor (Scart plug to Scart plug + 3.5 mm jack coupling) RCA phono adaptor (3.5 mm jack coupl. to 2 RCA phono plugs) Supplementary headphones HDR 65-4 (434 MHz) Supplementary headphones HDR 65-8 (863 MHz) Supplementary headphones HDR 65-9 (925 MHz) Cat. No. 47874 Cat. No. 72415 Cat. No. 04963 Cat. No. 04964 Cat. No. 04965
Earpads (1 pair) Cat. No. 77965
Charging options Weight (w/o mains unit) Dimensions
RS 65-8 UK 863 MHz variant with UK plug-in mains unit Cat. No. 04954
The RS 85 wireless RF headphone system with open, circumaural headphones features HiDyn plus noise reduction for wide dynamics and superb sound quality, ensuring a very natural and detailed sound reproduction. The RS 85 comes equipped with Center-LockTM Auto-Tuning. A simple touch of a button, and the headphones will automtically adjust to the transmitter (and can simply be re-turned with a second touch if it locks on to your neighbours transmitter). Features Uncompromising sound quality due to HiDyn plus noise reduction Lightweight, comfortable headphones incorporate volume control, one-touch auto-tuning and SAW input filter to eliminate RF interferences Reception through walls and ceilings, in the home and outside in the garden within a range of up to approx. 100 m (30 m for 925 MHz variant) Three switchable channels (2 for 863 MHz variant Supplied with second accupack Special audio filter in the transmitter eliminates TV interference

49 RS 85

Cat. No. 04956 RS 85-4 (434 MHz) Cat. No. 04957 RS 85-8 (863 MHz) Cat. No. 04958 RS 85-9 (925 MHz)
Technical Data HDR 85 Headphone Receiver
Transducer principle Frequency response THD Max. SPL Power supply Operating time Weight (with BA 151) dynamic, open 2022,000 Hz < 0.5 % 101 dB via BA 151 accupack, 2.4 V over 4 h per accupack approx. 160 g
Technical Data T 85 Transmitter
Carrier frequencies 434 MHz variant: 434.15 MHz, 433.4 MHz, 434.5 MHz (switchable) 836 MHz variant: 863.25 MHz, 863.75 MHz (switchable) 925 MHz variant: 925.0 MHz, 926.0 MHz, 926.5 MHz (switchable) up to approx. 100 m (up to approx. 30 m for 925 MHz variant) FM stereo typ. > 85 dBA 3.5 mm stereo jack plug with adaptor to 1/4 (6.3 mm) stereo jack plug and adaptor to RCA phono connectors 2, for headphones plus second BA 151 approx. 186 g 155 x 153 x 105 mm
SCART adaptor (Scart plug to Scart plug + 3.5 mm jack coupling) Supplementary headphones HDR 85-4 (434 MHz) Supplementary headphones HDR 85-8 (863 MHz) Supplementary headphones HDR 85-9 (925 MHz) Cat. No. 47874 Cat. No. 04966 Cat. No. 04967 Cat. No. 04968
Earpads (1 pair) Cat. No. 77965 Charging options Weight (w/o mains unit) Dimensions

RS 85-8 UK

Cat. No. 04958
The RS 2400 Stereo system consists of the TR 2400 RF transmitter and the RR 2400 RF stereo stethoset receiver and can be connected directly to television sets and hi-fi systems via the headphone socket. The lightweight stethoset headphones feature a convenient on/off/volume control. Features Excellent speech intelligibility, good music reproduction Complete freedom of movement, range of up to 100 m, sound transmission through walls Choice of 3 frequencies for optimum reception Receiver powered by environmentally friendly NiMH rechargeable accupack Transmitter can charge two accupacks at the same time Lightweight receiver (45 g incl. accupack), very comfortable to wear Delivery includes: 1 RR 2400 stereo stethoset receiver, 1 BA 151 accupack, 1 TR 2400 transmitter, 1 plug-in mains unit, 1 spare set of ear-cushions, 1 set of sealing tape for adjusting the frequency response, 1 AF connection cable with 3.5 mm/1/4 jack plug

Noise compensation with NoiseGard (open)

Attenuation/dB 0

Reduction of subjectively perceived noise with NoiseGard
HDC. The HDC range of Sennheiser headphones are equipped with the NoiseGard active noise compensation system.

5000 Frequency/Hz

52 Overview
HDC 451-1 NoiseGard mobile
Open stereo headphones with active noise compensation

HDC 451-1 NoiseGard

mobile
The HDC 451-1 NoiseGard mobile are open stereo headphones with active noise compensation for mobile applications. Features Reduction of ambient noise by up to 10 dB Protects the hearing and reduces stress Lightweight and comfortable to wear Considerably improves audio reproduction quality in noisy environments Powered via 2 AA size alkaline batteries or environmentally friendly NiCd rechargeable batteries Delivery includes: 1 HDC 451 NoiseGard mobile

Cat. No. 03840

Transducer principle Ear coupling Frequency response Nominal impedance THD Rated input voltage Active attenuation Max. SPL Operating voltage Contact pressure Weight without cable Connection cable Plug Power supply dynamic, open supra-aural 20 18,000 Hz 250 1% 387 mV at 1 Pa (94 dB) 10 dB 3 dB 100 dB linear 2 x 1.5 V approx. 1.6 N approx. 110 g 2 m, single-sided 3.5 mm stereo jack plug 2 x 1.5 V (AA) alkalinemanganese batteries or 2 x 1.2 V NiCd rechargeable batteries (AA) 600 mAh approx. 80 h (battery) approx. 20 h (NiCd)

Operating time

Earpads (1 pair) Cat. No. 46581
Headphones Supplementary IR and RF Headphones, Accessories

55 Overview

HDR 45-4 HDR 45-8 HDR 45-9 HDR 65-4 HDR 65-8 HDR 65-9 HDR 85-4 HDR 85-8 HDR 85-9 L 151-UK L 151-120
RI 150 RI 300 HDI 380 HDR 45
IR mono stethoset receiver IR stereo stethoset receiver IR hi-fi stereo headphones RF hi-fi stereo headphones

HDR 65

RF hi-fi stereo headphones

HDR 85

RR 2400 HZR 62 BA 151 L 151-2
RF stereo stethoset receiver Stereo volume control and headphone extension cable Headphone cable with right-angled jack plug Accupack for IS 150, IS 300, IS 380, RS 30, RS 40, RS 60, RS 80 and RS 2400 systems Charging unit for two BA 151 accupacks

L 151-10 NT 92

L 151-2

Euro version: L 151-2 Cat. No. 04457 UK version: L 151-2-UK Cat. No. 04458 USA version: L 151-2-120 Cat. No. 04459
Headphones Accessories Charging unit
Charging unit for up to 10 BA 151 accupacks or RI 150, RI 300 and RR 2400 receivers. Requires the NT 92 plug-in mains unit. Charging time Power supply Dimensions Weight approx. 10 h 12 V DC 325 x 98 x 42 mm approx. 400 g

L 151-10

Cat. No. 04494

Plug-in mains unit

Plug-in mains unit for one L 151-10 charging unit. Available as European, UK and USA versions.
Euro version: NT 92 Cat. No. 03357 UK version: NT 92-UK Cat. No. 03359 USA version: NT 92-120 Cat. No. 03358
Model Cat. No. Page Model Cat. No. Page Model Cat. No. Page BA 151..04146.56 HDR 45-8.04961.56 HDR 45-9.04962.56 HDR 65-4.04963.57 HD 200 Master.04592.23 English, French.04592.23 Am. English, Spanish..04593.23 German, Italian.04478.23 HD 202..05176.24 HD 212 Pro..05180.25 HD 25..02976.21 HD 250 II Linear.04393.26 HD 25 SP.03759.22 HD 26..04212.8 HD 265 Linear.04196.27 HD 270 Control.04549.28 English, French.04594.28 Am. English, Spanish..04595.28 German, Italian.04479.28 HD 433..04472.11 HD 433..04472.11 HD 437..05175.12 HD 457..05177.13 HD 477..05178.14 HD 497..05179.15 HD 500 Fusion.04589.16 English, French.04589.16 Am. English, Spanish..04588.16 German, Italian.04484.16 HD 570 Symphony..04553.17 English, French.04553.17 Am. English, Spanish..04552.17 German, Italian.04485.17 HD 580 Precision.04195.18 HD 590 Prestige.04590.19 English, French.04590.19 Am. English, Spanish..04591.19 German, Italian.04486.19 HD 600 Avantgarde.04465.20 HD 62 TV.05181.29 HDC 451-1 NoiseGard mobile.03840.53 HDI 380..04571.56 HDR 45-4.04960.56 RI 150..04383.56 RI 300..04378.56 RR 2400..04388.57 PX 30..04851.9 PX 40..04850.10 NT 92..03357.59 Euro vers.: NT 92.03357.59 UK vers.: NT 92-UK.03359.59 USA vers.: NT 92-120.03358.59 MX 300..04418.7 MX 400..04419.7 MX 500..04420.7 L 151... 58 Euro vers.: L 151-2.04457.58 UK vers.: L 151-2 UK.04458.58 USA vers.: L 151-2-120.04459.58 L 151-10.. 59 IS 150-120.04380.39 IS 300 Stereo..04150.40 IS 380..04449.41 HDR 65-8.04964.57 HDR 65-9.04965.57 HDR 85-4.04966.57 HDR 85-8.04967.57 HDR 85-9.04968.57 HE 90..03073.35 HEV 90 Orpheus..03074.35 HZR 62..05248.58 RS 2400 Stereo.04387.50 English, German.04387.50 French, Dutch..04693.50 Italian, Spanish..04694.50 RS 30-4..04806.45 RS 30-8..04807.45 RS 30-9..04809.45 RS 40-4..04960.46 RS 40-8..04961.46 RS 40-9..04813.46 RS 45-4..04948.47 RS 45-8..04949.47 RS 45-9..04951.47 RS 65-4..04952.48 RS 65-8..04953.48 RS 65-9..04955.48 RS 85-4..04956.49 RS 85-8..04957.49 RS 85-9..04959.49