Sennheiser RI 150 User manual

RI 150
IR Audio Transmission Technology | Receivers
Features
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Wideband stethoset receiver
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Extremely reliable transmission due to carrier frequency 2.3 MHz
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Extremely lightweight – only 45 g
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Excellent speech intelligibility and good music reproduction
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Very easy to use
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Operates on environmentally friendly rechargeable NiMH accupack
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Delivery includes:
RI 150: 1 x RI 150 mono stethoset receiver, 1 x BA 151 accupack
RI 250 and RI 250 J: 1 x RI 250 or RI 250 J mono stethoset receiver,
1 x BA 151 accupack, 1 set of adhesive tape for altering the frequency response
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. The audio-
logy variant RI 250 is fitted with an additional, recessed balance control. The RI 250 J
is fitted with a 3.5 mm jack output socket.
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 .........................................................approx. 110 dB
(RI 250 and RI 250 J: approx. 130 dB)
Audio output
(RI 250 J only) ............................ 3.5 mm jack (0.7 V/30 Ω)
Operating time ................................................ approx. 6 hrs
Weight ............................. approx. 45 g including accupack
Recommended Accessories
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BA 151 accupack Cat. No. 004146
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Charger for two BA 151
L 151-2 European version Cat. No. 004457
L 151-2-120 USA version Cat. No. 004459
L 151-2-UK UK version Cat. No. 004458
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L 151-10 charging unit for 10 receivers Cat. No. 004494
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Plug-in mains unit for one L 151-10
NT 92 European version Cat. No. 003357
NT 92-120 USA version Cat. No. 003358
NT 92-UK UK version Cat. No. 003359
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Plug-in mains unit for two to five L 151-10
NT 2013 European version Cat. No. 003433
NT 2013-120USA version Cat. No. 003434
NG 2013-UK UK version Cat. No. 054332
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Replacement earpads, black, firmer version Spare Part No. 037080
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Replacement earpads, transparent, softer version Spare Part No. 040949
Product Variants
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RI 150: mono stethoset receiver Cat. No. 004383
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RI 250: mono stethoset receiver, audiology variant
with balance control and higher SPL Cat. No. 004373
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RI 250 J: Mono stethoset receiver with audio output socket Cat. No. 004391
Dimensions of the RI 150/RI 250/RI 250 J
137 mm
20 mm
188 mm

RI 150
IR Audio Transmission Technology | 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 audiology variant RI 250 has additionally been fitted with a balance control to
compensate for hearing differences between the ears. The audiology version has
a higher SPL and comes with strips of adhesive tape for covering the apertures on
the earpieces. By sealing them, low-frequency response can be altered: the more
apertures are covered, the more the lower frequencies are attenuated. Thus, speech
intelligibility is increased without increasing the volume. Due to its balance control
and the option of altering low-frequency response, the RI 250 can be ideally matched
to the ears of its user.
At the bottom, the variant RI 250 J is fitted with an audio ouput socket (3.5 mm
jack). Users can wear the stethoset receiver as usual, or they can put the stethoset
arms around their neck and connect a pair of headphones to the receiver output
socket or have the sound transmitted to a suitable hearing aid via induction cou-
plers or an induction neck loop. The RI 250 J also comes with strips of adhesive tape
for altering the frequency response.
The receivers are 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 charg-
ing unit switches to trickle charging.
RI 150/RI 250/RI 250 J stethoset receiver
Apertures
for altering
the frequency
response
On/off/volume
control
Two IR receiving
diodes (behind
special plastic
cover)
Audio output,
3.5 mm jack
(RI 250 J only)
Inserted BA 151
accupack
Excellent ease of operation: The user has only to
operate the on/off/volume control
Audio output socket of the RI 250 J
RI 250/RI 250 J: Altering the low-frequency response
with the adhesive tape included with the unit
Three cascaded L 151-10 charging units with NT 2013
(or NG 2013-UK) plug-in mains unit and receivers