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The product should be located away from heat sources such as direct sunlight and
other sources of heat.
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The product should be connected to a power supply only of the type marked on the rear
panel of the product.
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The power supply cord of the product should be unplugged from the mains socket when
left unused.
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Avoid allowing any objects to enter inside the product or spilling any liquid into it.
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The product should not be used when:
1. The power supply cord or plug has been damaged
2. Objects have fallen or liquid has been spilled into the product
3. The product has been exposed to rain
4. The product does not appear to operate normally or exhibits a marked change in
performance
5. The product has been fallen or enclosure has been damaged
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Do not attempt to service the product. Refer servicing to qualified personnel.
The symbol of crossed-out wheeled bin is intended to inform the user that the
product is the subject to the requirements of the WEEE Directive of the European Parliament.
I.e. after the end of its lifetime the product should not be disposed as unsorted municipal waste
but should be collected separately.
Introduction
This 1-channel professional power amplifier provides high-value performance and
is intended to be used in so-called distributed sound systems
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The designed circuitry provides excellent sound quality and the steel chassis offers maximum
sturdiness. The amplifier can be used in standard 19“ rack mounting or separately.
The amplifier is equipped with LED display system, which provides information on amplifier
status in any lighting condition.
The connection system consists of XLR and RCA connectors for audio input and terminal block
for 50/70/100V output.
Distributed Sound System
Distributed sound systems or constant voltage systems are the most economical way to create
multi-speaker sound systems. A distributed sound system is commonly used for public places
such as schools, factories, hotels, stores, places of worship, etc.
In Europe is usual to have 100V system whereas in the USA 70V systems are usual. These
values relate to the maximum output voltage of the amplifier.
The main difference to a regular low-impedance system (4 or 8 Ohms) is the way of connecting
individual loudspeakers to the loudspeaker line. Many loudspeakers, each equipped with
a transformer, can be connected to one single output line. All of these loudspeakers have the
same input signal and are driven by one amplifier.
It is possible to use as many speakers as it is necessary as long as their total wattage does not
exceed maximum power of the amplifier. Speakers can be freely added or removed from the line
without affecting the levels of other speakers.
Each speaker’s transformer has relatively high impedance at the primary side to connect to the
100V (70V) line. The secondary side matches to the speaker itself (mostly 8 or 4 Ohm).
Depending on the maximum power of an amplifier each 100V (70V) amplifier matches to a
certain minimum impedance than can be connected to this output. It does not matter how this
impedance is achieved. We can use a large number of smaller speakers (with higher impedance
at their transformers) or a small number of larger speakers (with lower impedance at their
transformers) or any combination of them. The only rule is that the total impedance of the 100V
(70V) line should not fall below the minimum impedance of the amplifier's 100V (70V) output.
The regular signal (voltage) during the transmission of music or speech is mostly far less that the
maximum 100V (70V). The voltage in the line changes proportionally in the same way as the
voltage at the audio input of the amplifier, because the output voltage of an amplifier is
determined by the input signal only.
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