Clever Acoustics SL 4240 User manual

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SL 4120
4-CHANNEL AMPLIFIER
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SL 4240
4-CHANNEL AMPLIFIER
USER MANUAL
SL 4120 100V 4 x 120W Slave Amplier
SL 4240 100V 4 x 240W Slave Amplier
Order code: CRAM22
Order code: CRAM23
www.cleveracoustics.co.uk

CAUTION!
KEEP THIS EQUIPMENT
AWAY FROM RAIN,
MOISTURE AND LIQUIDS
CAUTION!
TAKE CARE USING
THIS EQUIPMENT!
HIGH VOLTAGE RISK
OF ELECTRIC SHOCK!!
1
WARNING
FOR YOUR OWN SAFETY, PLEASE READ THIS USER MANUAL CAREFULLY BEFORE
YOUR INITIAL START-UP!
SAFETY INSTRUCTIONS
Every person involved with the installation, operation and maintenance of this equipment
should:
- Be competent
- Follow the instructions of this manual
CAUTION! TAKE CARE USING THIS EQUIPMENT!
HIGH VOLTAGE-RISK OF ELECTRIC SHOCK!!
Before your initial start-up, please make sure that there is no damage caused during
transportation. Should there be any, consult your dealer and do not use the equipment.
To maintain the equipment in good working condition and to ensure safe operation, it is
necessary for the user to follow the safety instructions and warning notes written in this
manual.
Please note that damages caused by user modications to this equipment are not subject
to warranty.

2
IMPORTANT:
The manufacturer will not accept liability for any resulting damages caused
by the non-observance of this manual or any unauthorised modication to the
equipment.
• Never let the power-cable come into contact with other cables. Handle the
power-cable and all mains voltage connections with particular caution!
• Never remove warning or informative labels from the equipment.
• Do not open the equipment and do not modify the equipment.
• Do not switch the equipment on and off in short intervals, as this will reduce the
system’s life.
• Only use the equipment indoors.
• Do not expose to ammable sources, liquids or gases.
• Do not carry the unit with only one handle. Always carry using both handles.
• Always disconnect the power from the mains when equipment is not in use or
before cleaning! Only handle the power-cable by the plug. Never pull out the plug
by pulling the power-cable.
• Make sure that the mains supply voltage is between 220V-240V.
• Make sure that the power-cable is never crimped or damaged. Check the
equipment and the power-cable periodically.
• If the equipment is dropped or damaged, disconnect the mains power supply
immediately.
Have a qualied engineer inspect the equipment before operating again.
• If the equipment has been exposed to drastic temperature uctuation (e.g. after
transportation), do not switch it on immediately. The arising condensation might
damage the equipment. Leave the equipment switched off until it has reached
room temperature.
• If your product fails to function correctly, discontinue use immediately. Pack the
unit securely (preferably in the original packing material), and return it to your
Prolight dealer for service.
• Only use fuses of same type and rating.
• Repairs, servicing and power connection must only be carried out by a qualied
technician. THIS UNIT CONTAINS NO USER SERVICEABLE PARTS.
• WARRANTY; One year from date of purchase.
• If this equipment is operated in any other way, than those described in this
manual, the product may suffer damage and the warranty becomes void.
• Incorrect operation may lead to danger e.g.: short-circuit, burns, electric shocks.
• Do not endanger your own safety and the safety of others!
Incorrect installation or use can cause serious damage to people and property.

This 100V line slave amplier was designed specically for use in permanent audio
installations, where reliability and premium sound quality are a must. Highly rugged
construction and high efciency design make this amplier is ideal for continuous duty
applications in situations were power will be left on for indenite periods of time.
This 100V line amplier is warranted from defects for one year from the date of purchase.
Should your amplier require service, either within or beyond that warranty period, please
contact your Prolight Dealer.
This unit includes a host of features, along with an impressive list of specications, which
are detailed over the next pages. Please take the time to read this document completely
prior to installation of this product.
Slave amplier series are designed to suit multi zone applications in schools, ofces
and stores.
Features
• Four separate ampliers in a single 19” rackmount chassis
• 70V, 100V and 4-16Ω loudspeaker outputs
• Balanced XLR line input for each channel
• Convenient phoenix type terminal block output connectors
• Temperature, over-load, clip and short circuit protection
• Power, signal, clip, protection and temperature LEDs
• Fan cooled
3
Specications SL 4120 SL 4240
Power output: 4 x 120Wrms 4 x 240Wrms
Speaker outputs: 70V, 100V & 4-16Ω70V, 100V & 4-16Ω
Sensitivity: 775mV (0dB) 775mV (0dB)
S/N ratio: >90dB >90dB
Frequency response: 50Hz-16kHz, distortion
<1.5dB
50Hz-16kHz, distortion
<1.5dB
THD: <1% <1%
Cooling: Fan cooled Fan cooled
Indications: Power, signal, protection and
peaking
Power, signal, protection and
peaking
Protection: Power on, overload and short
circuit protection
Power on, overload and short
circuit protection
Power consumption: 720W 1500W
Power supply: 240V-50Hz 240V-50Hz
Dimensions (H x W x D): 88 x 484 x 448mm 132 x 484 x 448mm
Weight: 22kg 30kg
Order code: CRAM22 CRAM23

POWER
TEMP
ON
OFF
5
0
1
2
3
4 6
7
8
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CH1
5
0
1
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4 6
7
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CH2
5
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3
4 6
7
8
9
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CH3
5
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2
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4 6
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8
9
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CH4
PROTECT
SIGNAL
CLIP
4-CHANNEL AMPLIFIER
12
3
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3
12
3
12
3
CH 1 OUT CH 2 OUT
CH 3 OUT CH 4 OUT
CH 1 IN
www.prolight.co.uk
CH 2 IN
CH 3 IN CH 4 IN
COM
100V
4
70V
COM
100V
4
70V
COM
100V
4
70V
C OM
100V
4
70V
XLR BAL
INPUT
1-GND
2-HOT+
3-COLD-
~230V 50Hz 720W
T8AL 250V
4
SL 4240
SL 4120 16
12 121110
62 3
87
4
9
5
SL 4120
SL 4240
POWER
TEMP
ON
OFF
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CH1CH2CH3CH4
PROTECT
SIGNAL
CLIP
4-CHANNEL AMPLIFIER
12
3
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3
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3
1
2
3
XLR BAL
INPUT
1-GND
2-HOT+
3-COLD-
~230V 50Hz
T12AL 250V
CH 1 IN CH 2 IN
CH 3 IN CH 4 IN
70V
C O M
4
100V
70V
COM
4
100V
70V
COM
4
100V
CH 1 OU T
CH 3 OU T
CH 2 OU T
CH 4 OU T
70V
COM
4
100V
www.prolight.co.uk
16 62 34 5
12 12
13
13
13
14 15 16 18 17 19 20 22 21 23
111087 9
14 15 16 18 17 19 20 22 21 23

5
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 amplier into the rack, please make sure that
there is enough space around the amplier for the clear ow of cool air and the exhaust of hot air.
Be careful when mounting the amplier into the rack. Put the heaviest products into the lower part
of the rack. Be aware that fastening the amplier with four screws on the front panel is not
sufcient 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 amplier supplies a clear sound reproduction. Unnecessarily long
and thin cables used for low impedance (4-16Ω) speakers will inuence the damping factor and
thus the low frequencies in a negative way.
Identication:
1. Power LED - This LED will illuminate once the amplier is switched on and is ready for use.
2. TEMP LED - Temperature LED will illuminate when overheating. Switch off the amplier
and leave to cool down.
3. PROT LED - This LED will illuminate when the unit goes into protect mode. Switch off the
amplier and check the output connections for faults or short circuits before powering on and
resuming operation.
4. CLIP LED - This LED will ash when the output signal starts to distort. At this point turn the
master volume anti-clockwise to prevent damage.
5. SIGNAL LED - This LED will light up when signal is being received .
6. Fan vent - Do not obstruct, keep clear of dust.
7. On/off power switch - Use the switch to power the unit on or off.
8. CH1 volume control - Use this control to increase or decrease the volume of channel 1.
9. CH2 volume control - Use this control to increase or decrease the volume of channel 2.
10. CH3 volume control - Use this control to increase or decrease the volume of channel 3.
11. CH4 volume control - Use this control to increase or decrease the volume of channel 4.
12. Carry handles
13. Fan vent - Do not obstruct, keep clear of dust.
14. Power input - 240V 50Hz.
15. Mains fuse - If the mains fuse requires replacement, use the same type and value as
originally supplied.
16. CH1 loudspeaker output terminals - Connectors for 4-16Ω or 70V and 100V speakers.
17. CH2 loudspeaker output terminals - Connectors for 4-16Ω or 70V and 100V speakers.
18. CH3 loudspeaker output terminals - Connectors for 4-16Ω or 70V and 100V speakers.
19. CH4 loudspeaker output terminals - Connectors for 4-16Ω or 70V and 100V speakers.
20. CH1 XLR signal input - Use this to connect signal input from mixer ampliers.
21. CH2 XLR signal input - Use this to connect signal input from mixer ampliers.
22. CH3 XLR signal input - Use this to connect signal input from mixer ampliers.
23. CH4 XLR signal input - Use this to connect signal input from mixer ampliers.

6
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 amplier 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 amplier 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
amplier ON. The last product to be switched on is the amplier.
If you wish to power off the system, turn the amplier’s master volume control counter clockwise
to the “min” position before switching the amplier 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.
Machine operation
1. After connecting all audio source and powering on the power amplier, adjust the and the
master volume.
2. The Clever Acoustics amplier features output signal LED with PEAK indication. Should the
PEAK indicator illuminate (ashing) the output of the amplier is too high, turn the master volume
anti-clockwise to reduce the output.
3. The Clever Acoustics amplier all features protection with LED indication. Should the
PROTECT indicator illuminate, turn the master volume control anti-clockwise fully and switch off
the amplier for 15 seconds as the amplier 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
amplier persists to enter PROTECT mode the amplier 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 amplier or amplier load (ie Short Circuit).
4. Speaker & Amplier 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.

7
12
3
12
3
12
3
12
3
CH 1 OUT CH 2 OUT
CH 3 OUT CH 4 OUT
CH 1 IN
www.prolight.co.uk
CH 2 IN
CH 3 IN CH 4 IN
COM
100V
4
70V
COM
100V
4
70V
COM
100V
4
70V
C OM
100V
4
70V
XLR BAL
INPUT
1-GND
2-HOT+
3-COLD-
~230V 50Hz 720W
T8AL 250V
Panel Connections:
SL 4120, 4240
MAINS
ZONE MIXER
1.5V/600
-
+
dB
HF
LF
PAGE
GAIN
-10
+10
dB
-10
+10
dB
LF HF
MICROPHONE 1
GAIN
-8 +8
dB
PAGING MIC1 PAGING MIC2
-+
dB
GAIN GAIN
-+
dB
LINE 1 LINE 2
R
L
R
L
-+
dB
GAIN GAIN
-+
dB
LINE 3 LINE4
GAIN
-+
dB
GAIN
-+
dB -8 +8
dB
dB
-
+
dB
OUTPUT
REMOTESOURCE 1
HF
LF
0V 0V 0V 0V 0V 0V 0V 0V
11111111
++++++++
33333333
--------
22222222
PAGE
GAIN
-10
+10
dB
-10
+10
dB
-
+
dB
HF
LF
PAGE
GAIN
-10
+10
dB
-
+
dB
HF
LF
PAGE
GAIN
-10
+10
dB
-10
+10
dB
-
+
dB
HF
LF
PAGE
GAIN
-10
+10
dB
-10
+10
dB
-
+
dB
HF
LF
PAGE
GAIN
-10
+10
dB
-10
+10
dB
-
+
dB
HF
LF
PAGE
GAIN
-10
+10
dB
-10
+10
dB
-
+
dB
ZONE
8
GAINGAINGAINGAINGAINGAINGAINGAIN
HF
LF
PAGE
GAIN
-10
+10
dB
-10
+10
dB
0V0V0V0V0V0V0V0V 11111111
++++++++ 33333333
-------- 22222222
dB
-
+
dB
-
+
dB
-
+
dB
-
+
dB
-
+
dB
-
+
dB
-
+
dB
-
+
OUTPUT OUTPUT OUTPUT OUTPUT OUTPUT OUTPUT OUTPUT
ZONE
1
R
L
R
L
ZONE
2
ZONE
3
ZONE
4
ZONE
5
ZONE
6
ZONE
7
REMOTE SOURCE 2 REMOTE SOURCE 3 REMOTE SOURCE 4 REMOTE SOURCE 5 REMOTE SOURCE 6 REMOTE SOURCE 7
195mV-2V/47K 195mV-2V/47K 5mV-300mV/680
DISABLE
ENABLE
REMOTE
WALLCONTROL
DISABLE
ENABLE
REMOTE
WALLCONTROL
DISABLE
ENABLE
REMOTE
WALLCONTROL
DISABLE
ENABLE
REMOTE
WALLCONTROL
DISABLE
ENABLE
REMOTE
WALLCONTROL
DISABLE
ENABLE
REMOTE
WALLCONTROL
DISABLE
ENABLE
REMOTE
WALLCONTROL
DISABLE
ENABLE
REMOTE
WALLCONTROL
REMOTE SOURCE 8
300mV-1.1V/10K300mV-1.1V/10K300mV-1.1V/10K300mV-1.1V/10K300mV-1.1V/10K300mV-1.1V/10K300mV-1.1V/10K300mV-1.1V/10K
MASTER SLAVE1 SLAVE2 SLAVE3
COMMON
ALE R T
EVAC GROUND EMCIN
dB
123456 7 8 G
CONTACT CLOSURE
FIREALARM
LINK IN
LINK OUT
EXTENSION LINK
dB
+
-
+
-
INPUT VOLT AGE SELECTOR
dBdBdBdBdBdBdBdB
--------
++++++++
+-G
LINE 8
MIC:5mV LINE:350mV
+-G
LINE 7
MIC:5mV LINE:350mV
+-G
LINE 6
MIC:5mV LINE:350mV
+-G
MIC MIC MIC MIC LINE LINE
LINE LINE PHANTOM PHANTOM PHANTOM PHANTOM
LINE 5
MIC:5mV LINE:350mV
EMC
INPUTOUTPUT
TONE
-10
+10
dB
775mV/10K
BATTSUPPLY
24V 2A
~120V/240V 50-60Hz
120V 240V
1234
ON
1.5V/600 1.5V/600 1.5V/600 1.5V/600 1.5V/600 1.5V/600 1.5V/600
Speaker connections:
WARNING!
Be sure to attach the supplied terminal cover attached after connection. Because high
voltage is applied to the speaker terminals, care should be taken never touch these
terminals to avoid electric shock.
All speaker connections should be made using bare wire or suitable insulated crimp terminals.
Please ensure no loose strands are present as these may short across terminals causing damage
to the amplier.
Notes:
• Both the 4 - 16Ω, 70V and 100V terminals cannot be used at the same time.
• Impedances indicated in the gures represent the total speaker system (load) impedances.
Loads presented to the amplier must be equal to or greater than listed above. Speaker
impedances must be measured using a true impedance meter, do not standard multimeters.
Total impedance
41Ω (SL 120)
20Ω (SL 240)
14Ω (SL 350)
Total impedance
83Ω (SL 120)
42Ω (SL 240)
28.6Ω (SL 350)

8
Balanced XLR Jack Connection
Connection With The Mains
Connect the SL 4120 unit to the mains via the IEC mains inlet using the 13A UK IEC
cord supplied. Connect the SL 4240 unit to the mains via the captive mains cord.
The earth has to be connected.
Switch the unit on. After switching on the speaker system, wait 8 - 10 seconds before you turn the
volume control up in order to avoid speaker damage.
CAUTION! Increase the level of each channel up to the point where the clip LEDs illuminate.
Always check the sound pressure level with a meter in order to keep to the legal threshold.
Cleaning and Maintenance
We recommend a frequent cleaning of the product. Please use a soft lint free and moistened
cloth. Never use alcohol or solvents.
There are no serviceable parts inside the product except for the fuse. Maintenance and service
operations are only to be carried out by authorised dealers.
Replacing the fuse
Only replace the fuse by a fuse of the same type and rating.
Before replacing the fuse, unplug the mains lead.
Should you need any spare parts, please use genuine parts.
Should you have any further questions, please contact your dealer.
CAUTION
DANGER TO LIFE DISCONNECT
FROM THE MAINS BEFORE
STARTING MAINTENANCE
OPERATION
PROBLEM CAUSE SOLUTION
No power The power cord is not con-
nected.
Check the power cord and any
extension cables
No sound The power cord of the
respective product is not
connected properly or not at all.
The connection socket or the
plug is dirty.
Check the power cord and if
the plugs are properly
connected with the sockets.
Clean the socket, and/or the
plug.
Noise The input signal is too strong. Reduce the input signal via the
gain control.
Distorted sound Load impedance is to low. Check the load impedance
vs amplier specication, and
reduce if required.

www.cleveracoustics.co.uk