www.cleveracoustics.co.uk
SL Slave Amplifiers
User Manual
6
Panel & connection identification
and operating instructions
Rack installation
The SL Series are rack mountable. The rack you use should be a double door rack where you can open the front
and rear panel. When mounting the amplifier into the rack, please make sure that there is enough space around
the amplifier for the clear flow of cool air and the exhaust of hot air.
Be careful when mounting the amplifier into the rack. Put the heaviest products into the lower part of the rack.
Be aware that fastening the amplifier with four screws on the front panel is not sufficient to absorb impact from
road transit vibrations, additional support may be required.
Inputs
Short cables runs improve the sound quality remarkably. Input cables should be short and direct, since high
frequencies will mostly be absorbed if the cables are unnecessarily long. Besides that a longer cable may lead
to humming and noise problems. If the cable runs are unavoidable, you should use balanced cables.
Outputs
The high damping factor of your amplifier supplies a clear sound reproduction. Unnecessarily long and thin
cables used for low impedance (4-16Ω) speakers will influence the damping factor and thus the low frequencies
in a negative way.
Connect your speaker systems via the speaker terminals (COM = -VE)
Examples:
1) COM + 4-16Ω
2) COM + 70V
3) COM + 100V
Note: Please do not use more than one pair of output terminals
Connections To The Mains
Before connecting the amplifier to the local mains voltage outlet should be checked to ensure the available
supply is 240V~AC 50Hz. This product is CLASS1 and requires a protective mains earth to be connected at all
times. DO NOT remove or disconnect the earth.
Power On/Off Procedure
After connecting your amplifier to the mains, turn all controls counter clockwise to the “min” position. Turn on
audio sources (MP3 players, CD players, Microphones etc) before powering the amplifier ON. The last product to
be switched on is the amplifier.
If you wish to power off the system, turn the amplifier’s master volume control counter clockwise to the “min”
position before switching the amplifier OFF before any audio sources are switched off. By following this procedure
it will prevent acoustic shocks to the speakers or potential damage to system components.
Operation
1. After connecting all audio source and powering on the power amplifier, adjust the and the master volume.
2. The Clever Acoustics amplifier features output signal LED with PEAK indication. Should the PEAK indicator
illuminate (flashing) the output of the amplifier is too high, turn the master volume anti-clockwise to reduce the
output.
3. The Clever Acoustics amplifier all features protection with LED indication. Should the PROTECT indicator
illuminate, turn the master volume control anti-clockwise fully and switch off the amplifier for 15 seconds as the
amplifier may have entered PROTECT mode temporarily due to a peak signal, care should then be taken to ensure
all input levels are set correctly. If the amplifier persists to enter PROTECT mode the amplifier should be switched
off and left to cool for 5-10 minutes before switching back on. If the PROTECT indicator remains lit this indicates
a problem with the amplifier or amplifier load (ie Short Circuit).
4. Speaker & Amplifier systems can produce high sound pressure levels, please operate all controls with caution
to ensure people are not exposed to excessive or dangerous sound pressure levels.
