JB Systems C3-1800 Operation Manual page 4

ENGLISH
 This appliance must be earthed to in order comply with safety regulations.
 In order to prevent electric shock, do not open the cover. Apart from the mains fuse there
are no user serviceable parts inside.
 Never repair a fuse or bypass the fuse holder. Always replace a damaged fuse with a
fuse of the same type and electrical specifications!
 In the event of serious operating problems, stop using the appliance and contact your
dealer immediately.
 Please use the original packing when the device is to be transported.
 Due to safety reasons it is prohibited to make unauthorized modifications to the unit.
INSTALLATION GUIDELINES:
 Install the unit in a well-ventilated location where it will not be exposed to high
temperatures or humidity.
 Placing and using the unit for long periods near heat-generating sources such as
amplifiers, spotlights, etc. will affect its performance and may even damage the unit.
 The unit can be mounted in 19-inch racks. Attach the unit using the 4 screw holes on the
front panel. Be sure to use screws of the appropriate size. (screws not provided)
Take care to minimize shocks and vibrations during transport.
 When installed in a booth or flight case, please make sure to have good ventilation to
improve heat evacuation of the unit.
 To avoid condensation to be formed inside, allow the unit to adapt to the surrounding
temperatures when bringing it into a warm room after transport. Condense sometimes
prevents the unit from working at full performance.
CLEANING THE APPLIANCE:
Clean by wiping with a polished cloth slightly dipped with water. Avoid getting water inside
the unit. Do not use volatile liquids such as benzene or thinner which will damage the unit.
CONNECTIONS
Be sure to turn off the unit before you make changes to the wiring. For the signal inputs we
recommend using good quality signal cables to ensure excellent audio quality. For
example use JB cables with
order codes: 7-0061
(XLR/XLR L=1m) or 7-0063
(XLR/XLR L=5m). For the
speakers you must use the
Speakon® compatible
outputs. Suitable cables are
for example JB order codes:
2-0505 (L=5m) or 2-0510
(L=10m).
The picture shows one of
the possible setups with the
C3-1800 amplifier.
JB SYSTEMS
®
OPERATION MANUAL
3/37 C3-1800
ENGLISH
FUNCTIONS
(FRONT)
1. SATELLITE GAIN CONTROLS: These potentiometers are used to control the input
sensitivity of the amplifier for the satellites. Each channel has its own control.
You can use these controls to set the maximum sound level of your setup:
 Turn both controls on the amplifier (1) to the left.
 Put on some music on and make sure the VU meters on your mixer are at 0dB. (from
time to time the red zone is lit)
 Set the Master output from your mixer to maximum.
 Open the Gain controls from the amplifier (1) until the maximum desired sound level
is reached.
 Make sure nobody can reach the Gain controls of the amplifier.
You have just set the maximum level the DJ is able to produce. Your neighbors will be
glad... (in some cases the DJ is not )
2. PROTECT LED: The protection LED is on when the speakers are disconnected from
the amplifier. This occurs in the following situations:
 During the first seconds after switching on the amplifier.
 When the temperature of the power stage becomes too high.
 In case of a technical defect: DC protection!
 While switching the amplifier off, the "protect led" may turn on for a short time.
3. CLIP LED: Turns on just before the maximum, distortion free, output level of the
amplifier. The clip leds may turn on shortly from time to time but they may certainly not
turn on for longer periods. In this case you have to turn the output level down!
4. SIGNAL LED: The green signal led indicates that a music signal is present at this
channel input.
5. SUB BASS GAIN CONTROL: This potentiometer is used to control the sensitivity of
the sub bass amplifier. Put on some music and turn this control slowly up until there's a
nice balance between the high/mid satellite speakers and the subwoofer.
6. SUB PROCESSOR: Controls the amount of low band signal, produced by the bass
processor, from zero to maximum. The setting depends on the application and can be
adapted to your own taste.
Important: Note that the bass processor should be used with care to avoid possible
speaker damage. Most smaller and economical subwoofers are not capable of
handling the low frequencies produced by this unit.
JB SYSTEMS
®
OPERATION MANUAL
4/37 C3-1800