Chevin S240LP, S480LP User Manual

USER MANUAL

S240LP/S480LP

PROFESSIONAL POWER AMPLIFIER

Chevin Research, Kreuzbichlstraße 29, A-6112 Wattens, Austria

Tel/Fax: [phone]

chevin.martin @aon.at , [e-mail]

www.chevin-research.com

Contents

Important Safety Instructions .................

Introduction ............................................

Distributed Sound System......................

Installation and Use ...............................

Front Panel ............................................

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8

Rear Panel .............................................

Connection Example ..............................

Technical Specifications S204LP ...........

Technical Specifications S480LP ...........

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Caution: To reduce the risk of electric shock do not remove the cover.
No user-servicable parts inside. Refer servicing to qualified service personnel.
Warning: To prevent fire or electric shock do not expose this equipment to rain or moisture.

The exclamation point within an equilateral triangle is intended to alert the user to the
presence of important operating and servicing instructions in the literature accompanying the
product.

The lightning flash with arrowhead symbol within an equilateral triangle is intended
to alert the user to the presence of uninsulted “dangerous voltage” within the product’s enclosure
that may be of sufficient magnitude to constitute a risk of electric shock.

WARNING - When using electric products basic precautions should always be followed,
including the following:

- Read all these instructions before using the product.

- Do not use the product near water e.g. near swimming pool, kitchen sink, bathtub, or in

a wet basement, etc.

- This product, either alone or in combination with other sound equipments, is capable of
producing sound levels that can cause permanent hearing loss. Do not operate the
product for a long time at high volume level.

- The product should be located away from heat sources such as direct sunlight or other
sources of heat.

- The product should be connected to a power supply only of the type marked on the rear
panel of the product.

- 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.

- 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 enclosure has been damaged.

- 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.
The circuit design provides excellent sound quality and the steel chassis offers maximum
strength. The amplifier can be used in standard 19“ rack mounting or separately.
The amplifier is equipped with LED display system which provides information on the amplifier
status.
The connection system consists of XLR for audio input and terminal block for 50/70/100V output.
The S240LP incooperates convection cooling as does the S480LP with the adition of a fan for
extreme operating conditions.

Distributed Sound System

Distributed sound systems or constant voltage systems are the most economical way to create
multi-speaker sound systems. Distributed sound systems are commonly used for public places
such as schools, factories, hotels, stores, places of worship, etc.

In Europe it is usual to have 100V system whereas in the USA 70V system is 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 loudspeakers as it is necessary as long as their total wattage does
not exceed the maximum power of the amplifier. Loudspeakers can be freely added or removed
from the line without affecting the output levels of other sloudpeakers.

Each speaker’s transformer has a 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 that can be connected to the 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 the two. 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 far less than 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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Installation and use

ATTENTION !!
To avoid the risk of fire or electric shock :

Do not open the amplifier – all user-adjustable parts are external - refer servicing to qualified
personnel !
If replacing the fuse is necessary use only the same type and rating !
Do not expose the amplifier to rain or moisture !

This manual contains important information for correct and safe use. Read it carefully before
using the amplifier. Keep it for future consultation.

Connection to the mains supply

Before connecting the amplifier to the mains socket always make sure that :

- The electric system and mains socket have an adequate grounding – compatible with
the safety norm (If you are uncertain consult specialized personnel);

- The mains voltage corresponds to that shown on the rear panel ( accepted allowance is
up to +/-10%);

- Power cord is not damaged and has no bare wires;

- The on/off switch is in the off position.

Also make sure that the amplifier is off before disconnecting the power cord from the mains
socket.

Switching on and off
In your sound reinforcement system always switch on the amplifier after all the other equipments

and always switch it off before them, if possible with gain control set at minimum – this will avoid
dangerous signal peaks.

Installation

The amplifier can be used in 19” rack mounting or separately.
The amplifier is convection cooled so must always be placed or installed with adequate free air
flow and ventilation.

S240LP:

The amplifier is convection cooled i.e. it has no fan.
It is recommended to keep the heatsink free to allow unobstructed air flow especially if there is
any other equipment that cause air warming.
Do not expose the amplifier to direct sunlight or any source of heat or rain. Do not locate it in
particularly dusty surroundings.

S480LP:

The amplifier generates decidedly high power so it should be installed in locations with good air
circulation.
During usual operation the amplifier is conventionally cooled. In case of abnormal increasing of
temperature the fan is activated to handle this unwanted situation. After coming back to normal
conditions the fan stops.
It is recommended to keep the heatsink and side vents free to allow full air flow. To have enough
cool air is important especially if there are any other equipment that cause air warming.

Do not expose the amplifier to direct sunlight or any source of heat or rain. Do not locate it in
particularly dusty surroundings.

Not respecting these regulations can cause faulty operation or even electric shock or fire.

Audio connections

Always use good quality cables of the appropriate type.
Take care of cables and check their condition frequently. Grip them by the connector, do not pull
them forcefully and wind them without knots and sharp bends.
Bad quality of cables is frequent cause of small/big operation problems.

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