Crescendo 20.4 System Instructions
Crescendo 20/4 Loop Receiver
The sound output levels from this system can be very high. It is
recommended that the volume control should be turned to the "OFF"
position before changing the battery or plugging in or unplugging the
headphones or microphone.
Instructions for use
1. Plug the headset into the socket marked <PHONES>.
2. Make sure that the loop system is switched on and that you are within its coverage area.
3. Turn the Crescendo's volume control clockwise until the desired headset volume is
reached. Remember to switch off the amplifier when not in use by turning the knob
fully anti-clockwise, when a "click" will be felt.
4. The amplifier is fitted with a 3 position switched Tone control on the side. In the
<HIGH> position the amplifier will emphasise the higher frequency range and in the
<LOW> position the lower frequency range. In the <NORM> position the high or low
frequencies are not emphasised.
5. It may be necessary to turn or move the amplifier to get the best signal.
The product should give a long and trouble-free service if the following points are observed.
• Treat the headset and microphone leads carefully, they are quite thin in order to be
convenient and comfortable to use.
• DO NOT wrap the leads around the amplifier.
• DO NOT leave leads trailing across the floor to be tripped over.
Battery Changing
To change the battery in the amplifier, turn it over and whilst pressing down, slide the
battery cover in the direction of the arrow. The old battery can now be removed by turning
the unit over and tapping gently. Unclip the connector from the battery. Fit a new battery
making sure that the wires are tucked out of the way. Slide the battery cover into place.
Battery type : PP3, 6R61, MN1604, 6LF22 or equivalent. We would suggest that batteries
are bought from a reputable shop with a reasonable turnover to ensure "fresh" stock. There
is little difference in the cost of running the Crescendo with either ordinary or alkaline
batteries. The alkaline type will last longer but cost more.
Mains Adaptor
The Crescendo 20 amplifier may be used with the Sarabec mains adaptor. If the mains
adaptor is to be used exclusively, please remove the batteries to prevent leakage and damage
to the amplifier. The adaptor should be unplugged when not in use.
If another type of mains adaptor is used damage could be caused to the equipment if
inappropriate voltages, currents or polarity are used. The amplifier requires a 6V DC supply
with a current rating greater than 200mA. If the amplifier does not work with another type
of adaptor switch off and unplug straight away.
Problems and Cures
No Sound
• Headset in wrong socket - change round.
• Battery exhausted - fit new battery.
Low or distorted sound
• Battery almost exhausted -fit new battery.
• Headset blocked with wax - clean headset ends or fit new
Buzz or squeal after short • Battery almost exhausted, system will seem OK when first
switched on - fit new battery
Crackling or
• Dirty plug - clean plug.
Sound goes on & off
• Faulty lead - wiggle lead by plug to find faulty lead, replace
Tinny or muffled sound
• Tone control in wrong position - switch to another position.
If in doubt please contact your dealer for assistance.
The headset ends can be removed for cleaning and removal of wax. They can be washed in
warm soapy water but must be thoroughly dried before replacing.
Headphones or neck loops with mono jack plugs will not work correctly with the Crescendo
20 and may cause damage to the amplifier.
If the system needs to be returned for repair please send the complete system including the
amplifier and headset.
Please state the nature of the fault and the return address. If the system is still under
guarantee please state this and provide proof of purchase.
Accessories and Spares
A full list of accessories and spares with prices is shown in our current product guide,
available on request. Please check the current price and quote both the description and part
number when ordering.
Part No.
Standard Microphone with 4m(12ft) BLACK lead and Velcro pads
Standard Microphone with 4m(12ft) WHITE lead and Velcro pads
Short lead Microphone with 1m(3ft) BLACK lead
Communicator Microphone with NO lead, direct plug in.
Crescendo direct audio lead kit to replace microphone
Crescendo direct audio lead for SCART socket
Microphone extension lead 3m(10ft)
Microphone extension lead 5m(15ft)
Velcro pads kit, One hook type and three black loop type pads
To obtain this kit only, please send two second class stamps
Stethoscope headset complete
Stethoscope headset lead
Stethoscope headset foam pads (pack 10)
Lightweight headphones
Neck Loop with 1m(3ft) lead
Ear Loop with 1m(3ft) lead
Crescendo 20 mains adaptor 6V 200mA
Crescendo 20/4 Loop Receiver
Personal Sound System
Owner’s Manual
The Crescendo 20/4 system is an easy to use amplifying system for listening to loop systems
without a hearing aid. The system works in exactly the same way as a hearing aid switched
to the “T” position. It can also be used to check the operation of a loop system without a
hearing aid.
With one simple volume control the user’s volume can be easily varied without affecting
others. A 3 position tone control allows you to boost the high or low frequencies to suit your
needs. A loop pickup facility allows you to pickup loop signals without using a hearing aid.
The Crescendo 20/4 Loop Receiver is supplied ready to use with a battery and high
efficiency stethoscope headset.
Product conforms to the provisions of the following European Union Directives :
• 89/336 & 92/31 Electro Magnetic Compatibility Directives
• 93/68 CE Marking Directive
is a mark of Sarabec Ltd.
© Sarabec Ltd 105-104.003 1298 Cres 20.4 .doc
Sarabec Limited 15 High Force Road Middlesbrough TS2 1RH
Telephone (01642) 247789 Fax (01642) 230827 Text (01642) 251310
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