Sennheiser RI 150 User manual

RI 150

Infrared Wireless Systems | Receivers

Features



Wideband stethoset receiver



Extremely reliable transmission due to carrier frequency 2.3 MHz



Extremely lightweight – only 1.6 oz.



Excellent speech intelligibility and good music reproduction



Very easy to use



Operates on environmentally friendly rechargeable NiMH accupack



Delivery includes: 1 x RI 150 mono stethoset receiver,

1 x BA 151 accupack

General Description

The RI 150 is an extremely lightweight wideband stethoset receiver which uses the

carrier frequency 2.3 MHz, thus offering excellent transmission reliability. It features

an easy-to-operate on/off/volume control and is powered by the environmentally

friendly BA 151 rechargeable NiMH accupack delivered with the receiver.

Technical Data

Modulation ..........................................wideband-FM, mono

Carrier frequency ......................................................2.3 MHz

AF frequency response...............................18 – 18,000 Hz

THD ................................................................................... < 1 %

Signal-to-noise ratio ............................................typ. 70 dB

Max. SPL .............................................................appx. 110 dB

Operating time .................................................... appx. 6 hrs

Weight incl. battery ......................................approx. 1.6 oz.

Recommended Accessories



BA 151 accupack Cat. No. 004146



Charger for two BA 151

L 151-2-120 USA version

Cat. No. 004459



L 151-10 charging unit for 10 receivers

Cat. No. 004494



Plug-in mains unit for one L 151-10

NT 92-120 USA version

Cat. No. 003358



Plug-in mains unit for two to five L 151-10

NT 2013-120USA version Cat. No. 003434



Replacement earpads, black, firmer version Spare Part No. 037080



Replacement earpads, transparent, softer version Spare Part No. 040949

Dimensions of the RI 150

5.3”

0.75”

7.4”

RI 150

Infrared Wireless Systems | Receivers

The RI 150 mono receiver works on the extremely reliable carrier frequency 2.3 MHz,

offering excellent speech intelligibility and good music reproduction due to its wide

frequency response. A built-in squelch avoids loud hiss when the signal from the

IR radiators is too weak, for example when a receiver is used outside the radiator

coverage area. The RI 150 is an elegantly shaped receiver which is very easy to use:

the only control the wearer has to operate in order to hear the transmitted signals

is a combined on/off/volume control with a small position indicator for reading off

the volume.

The receiver is powered by the environmentally friendly BA 151 NiMH accupack. For

domestic applications, the L 151-2 charger is the optimum choice: it is designed for

two BA 151 accupacks and comes complete with mains unit. For professional appli-

cations, Sennheiser has designed the L 151-10 charging unit. It can recharge up to

ten BA 151 directly in the receivers, as the accupack charging contacts are located

on the outside. Alternatively, you can also charge BA 151s separately, e.g. in case

you have spare accupacks. The L 151-10 requires the NT 92 plug-in mains unit, which

can be ordered separately in the version you require (European, UK or USA versions

available).

The L 151-10 can also be cascaded: up to five charging units can be joined by means

of the cascading bars fixed to the bottom of the units. Two to five cascaded L 151-10

are powered by an NT 2013 (or NG 2013-UK) plug-in mains unit. The recharging of

the receivers is carried out automatically and takes 10 hours. After that, the charg-

ing unit switches to trickle charging.

RI 150 stethoset receiver

Apertures

for altering

the frequency

response

On/off/volume

control

Two IR receiving

diodes (behind

special plastic

cover)

Inserted BA 151

accupack

Excellent ease of operation: The user has only to

operate the on/off/volume control

Three cascaded L 151-10 charging units with NT 2013

(or NG 2013-UK) plug-in mains unit and receivers

Sennheiser Electronic Corporation

One Enterprise Drive, Old Lyme, CT 06371

Tel: (860) 434-9190 • Fax: (860) 434-1759

www.sennheiserusa.com

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