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 ex tremely lightweight wideband stethoset receiver which uses the
carr
ier frequency 2.3 MHz, thus of fering 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 Acc
essories
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
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
cover age 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 applications, 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 charging 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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