JB Systems C3-1800 Mode D'emploi page 5

ENGLISH
7. PHASE INVERT switch: Sometimes the conductors of the subwoofer are inversed
which results in poor sound quality with a lack of low frequencies: the opposite of what
you expected! This can be corrected by inversing the (+) and (-) poles of the cabling to
your subwoofer or ... by pushing the PHASE INVERT switch! Use a thin pen to press
the phase invert switch and compare the results of both positions. The position with the
most bass production is the right one!
8. MAINS SWITCH: Used to turn the amplifier on and off. A few seconds after switching
on the amplifier it is ready for operation. The blue led is on when you turn the amplifier
on.
FUNCTIONS
(REAR)
9. FAN & VENTILLATION HOLES: during its operation the amplifier produces heat that
must be dissipated. The fans inside the amplifier must be able to evacuate the heat in
the most effective way. Therefore is it very important not to cover any of the ventilation
openings as this may result in overheating.
10. MAINS input: When all audio cables are connected, you can connect this cable to
mains outlet.
11. RESET button: this amplifier uses an automatic fuse. When the fuse is blown, simply
press the button to rearm it.
12. SUBWOOFER OUTPUT: use this Speakon® compatible connector to connect your
subwoofer cabinet. Refer to chapter "connections" to
learn which cables are suitable.
13. SATELLITE OUTPUTS: use these
compatible connectors to connect your mid/high
satellite cabinets. Refer to chapter "connections" to
learn which cables are suitable.
14. XLR/JACK inputs: You can connect these balanced
inputs to balanced and unbalanced line level audio
sources (example: DJ-mixer):
 Balanced source: Use good quality XLR/XLR balanced audio cables.
Example: JB Systems 7-0061 (XLR/XLR L=1m) or 7-0063 (XLR/XLR L=5m)
Wiring of the XLR connector: PIN1: GND PIN2: pos+ PIN3: neg-.
Wiring of the JACK connector: Sleeve: GND TIP: pos+ RING: neg-.
 Unbalanced source: Use good quality XLR/cinch or JACK/cinch audio cables.
Example: JB Systems 2-0445 (XLR/cinch L=1.5m)
Example: JB Systems 2-0430 (JACK/cinch L=1.5m) or 2-0435 (L=3.0m)
JB SYSTEMS
®
OPERATION MANUAL
Speakon®
5/41 C3-1800
ENGLISH
15. GROUND LIFT switch: In some cases nasty hum noises can occur due to ground
loops in your setup. Setting the Ground lift switch to the position "lift" breaks the ground
loop between the amplifier and the chassis grounds of various other components in
your setup. As a result the hum noises disappear.
16. HIGH PASS FILTER: With this switch you can choose to filter the satellite outputs or
not. If you use small satellite speakers than we strongly suggest to switch the high pass
filter on to protect the small speakers. If you use bigger satellite speakers (for example
15") than you can switch this filter off. The satellite speakers will receive more low
frequencies.
C3-1800 used as a 2-channel amplifier: You can also use this switch in another way:
you can use the C3-1800 as an ordinary 2-channel amplifier. Just put the high pass
filter switch in OFF position, connect 2 speaker cabinets to the satellite outputs (13)
and don't use the subwoofer output(12). However don't forget to put the sub bass gain
control (5) to zero.
17. X-OVER FREQ. control: (crossover frequency control) adjusts the cutoff frequency of
the active filter. This crossover frequency can be set in a range of 90 to 250Hz. It's up
to you to adapt its position to your own taste. For most subwoofers 90Hz to 150Hz
seems to be the best choice.
18. LIMITER switch: This amplifier has build-in limiters to protect both the amplifier and
the connected speakers. We strongly suggest to put this switch in on position at all
times. Nevertheless if you are experienced or you use an external limiter you can
switch the internal limiters off.
SPECIFICATIONS
Power Satellite outputs @ 4Ω 2x 450Wrms
Power Satellite outputs @ 8Ω 2x 300Wrms
Power Subwoofer outputs @ 4Ω 1x 900Wrms
Power Subwoofer outputs @ 8Ω 1x 600Wrms
Freq. Resp. (+/-0.5dB)
20 - 20000Hz
Activecrossover 90-250Hz (24dB/oct. Linkwitz Riley)
Input Sensitivity 770mV
Input impedance 20 kΩ (bal) / 10kΩ (unbal)
S/R ratio
>90dB
Damping factor >500
Cooling dual speed fan cooling
Inputs balanced/unbalanced COMBO (XLR/Jack)
Outputs Speakon
Power supply AC230V / 50Hz
Dimensions (mm) 483x473x88(19"/2U)
Weight 24kg
Every information is subject to change without prior notice
You can download the latest version of this user manual on our website: www.beglec.com
JB SYSTEMS
®
OPERATION MANUAL
®
6/41 C3-1800