JB Systems amp 100.2 Mk2 Mode D'emploi page 6

ENGLISH
important not to cover any of the ventilation openings as this may result in overheating. Clean the
ventilation holes regularly with a vacuum cleaner. This increases the cooling capacity of the amplifier
fans and helps preventing temperature overheat.
FUNCTIONS (rear)
11. XLR 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-.
 Unbalanced source: Use good quality XLR/cinch audio cables.
Example: JB Systems 2-0445 (XLR/cinch L=1.5m)
12. BALANCED XLR OUTPUTS: Can be used to send the signal to the next amplifier. Pin1: signal ground,
Pin2: signal+, Pin3: signal -
13. INPUT SENSITIVITY switch: With this switch you can perfectly adapt the input sensitivity of the
amplifier: 0,775V; 1,0V or 1,44V.
14. OPERATION MODE switch: Used to set the operation mode of the amplifier. The most common
operation mode is "stereo". If you need more power, you can operate the amplifier in bridge mode. Refer
also to point 9 and "HOW TO USE" for more information.
15. LOW CUT FILTER switch: eliminates low frequencies under 75Hz. Can be used when small speakers
are connected, these cabinets often don't support very low frequencies.
16. 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.
17. L+R SPEAKON OUTPUTS: use these Speakon
connect your speaker cabinets in stereo or mono mode. Wiring of
these connectors is as follows:
 POS(+) = Speakon connector PIN1+ and PIN2+
 NEG(-) = Speakon connector PIN1- and PIN2-
18. BRIDGE SPEAKON OUTPUT: use this Speakon
connect your speaker cabinet in bridge mode. Refer to points 3 and 12 for more information. Wiring of
this connector is as follows:
 POS(+) = Speakon connector PIN1+ and PIN2+
 NEG(-) = Speakon connector PIN1- and PIN2-
19. 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)
JB SYSTEMS
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OPERATION MANUAL
AMP Mk2-series