Rear Panels - JB Systems AX Series Operation Manual

ENGLISH

REAR PANELS

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. SPEAKON OUTPUTS: use these Speakon® compatible connectors to connect your
speaker cabinets. Refer to chapter "connections" to learn which cables are suitable.
Wiring of these connectors is as follows:
• POS(+) = Speakon connector PIN1+ and PIN2+
• NEG(-) = Speakon connector PIN1- and PIN2-
11. BINDING POST SPEAKER OUTPUTS: We strongly suggest you to use the
Speakon® connectors as described above(10). If you don't have these or you want to
use the amplifier in bridge or parallel mode, you can use the binding post connectors.
Important: Use cables that have clear markings for + and – poles. We suggest using
red/black cables (such as JB Systems order code: 935). It is very important that you
don't switch the + and – poles of the outputs. This results in very poor sound
reproduction without low frequencies! There are 3 ways to connect the speaker
cabinets using the binding post connectors:
JB SYSTEMS® 5/42
OPERATION MANUAL
AX / VX - AMPLIFIERS
ENGLISH
• STEREO MODE (most common): Connect the speaker cables as shown on the
drawing below. Make sure not to switch the red and black wires. Be sure to set
the switch on the rear panel to "stereo". On the AX400 / VX400 this switch is not
available.
• BRIDGE MODE: (only for VX200 and AX700MK2 / VX700MK2) Connect the
speaker cables as shown on the drawing below. Be sure to set the switch on the
rear panel to "bridge". Also refer to (6) in the previous chapter.
• PARALLEL MODE: (only for VX200) Connect the speaker cables as shown on
the drawing below. Be sure to set the switch on the rear panel to "parallel". Also
refer to (8) in the previous chapter.
12. 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.
13. MODE switch: (not for AX400 / VX400) 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 or parallel mode. Refer to points (6), (8) and (11)
for more information.
JB SYSTEMS® 6/42
OPERATION MANUAL
AX / VX - AMPLIFIERS