User Manual

ENGLISH USER MANUAL
JB SYSTEMS
®
4/7 AMP 200.4
FUNCTIONS (rear)
11. VENTS: these openings allow the amplifier to be properly cooled by the built-in fans. Make sure these
are not covered and clean them promptly
12. POWER input: Use the supplied power cable to connect the amplifier to the mains. This connector also
holds a 20mm glass fuse. Always replace a blown fuse by another with exactly the same specifications.
(fuse specifications can be found on the rear panel, next to the power input connector)
13. XLR input INA: balanced XLR input. In 2 SAT+SUB mode, this input is not used
14. XLR input INB: balanced XLR input. Only used while amplifier 1 works in STEREO mode. In MONO,
BRIDGE or 2 SAT+SUB mode, this input is not used
15. XLR input INC: balanced XLR input.
16. XLR input IND: balanced XLR input. Only used while amplifier 2 works in STEREO mode or in 2
SAT+SUB mode. In MONO or BRIDGE mode, this input is not used
17. SPEAKER output OUTA:.
• In MONO or STEREO mode: 1+ = positive (red) wire, 1- = negative (black) wire
• In BRIDGE mode (minimum 8 Ohm!): 1+ = positive (red) wire, 2+ = negative (black) wire
18. SPEAKER output OUTB:.
• In MONO or STEREO mode: 1+ = positive (red) wire, 1- = negative (black) wire
• In BRIDGE mode: NOT used
19. SPEAKER output OUTC:.
• In MONO or STEREO mode: 1+ = positive (red) wire, 1- = negative (black) wire
• In BRIDGE mode (minimum 8 Ohm!): 1+ = positive (red) wire, 2+ = negative (black) wire
20. SPEAKER output OUTD:.
• In MONO or STEREO mode: 1+ = positive (red) wire, 1- = negative (black) wire
• In BRIDGE mode: NOT used
21. GROUND LIFT: used to break eventual ground loops and thus solve humming noises
22. OPERATION MODE switch: Used to set the operation mode of amplifier 1 (OUT.A & OUT.B):
• STEREO: The most common operation mode, IN.A (13) & IN.B (14) are routed to their
corresponding outputs OUT.A & OUT.B.
• PARALLEL: only the mono signal on input INA (13) is used to drive both outputs CH.A+CH.B.
• BRIDGE: used when you need more power. Only the mono signal on input IN.A (13) is used to
drive the combined “bridged” output OUT.A (17). Only speakers with impedance >8ohm are
allowed.
IMPORTANT: the wiring of the OUT.A speaker connector in bridge mode is DIFFERENT ! Check
the information about the speaker outputs below
23. LOW PASS filter switch: When ON, only frequencies below 120 Hz will be sent to the output(s) OUT.A
& OUT.B. This is very useful when you want to connect subwoofer(s) to the outputs.
24. OPERATION MODE switch: Used to set the operation mode of amplifier 2 (OUT.C & OUT.D):
• 2SAT+SUB: this special mode makes it possible to drive 2 satellite speakers + a subwoofer
without having to use an external crossover !
• The inputs IN.C & IN.D will receive the stereo signal from your audio source or mixer.
• OUT.C & OUT.D will be used for the satellite speakers (HIGH PASS filter (25) can be
used if needed).
• OUT.A will be used in BRIDGE mode for the subwoofer
• STEREO: The most common operation mode, INC (15) & IND (16) are routed to their
corresponding outputs OUT.C & OUT.D.
• PARALLEL: only the mono signal on input IN.C (15) is used to drive both outputs OUT.C+OUT.D.