User Manual

ENGLISH USER MANUAL
JB SYSTEMS
®
3/7 AMP 200.4
1. MAINS SWITCH: Used to turn the amplifier on and off. A few seconds after switching on the amplifier it
is ready for operation.
2. POWER LED: This white led is on when you turn the amplifier on using switch (1).
3. SIGNAL LEDS: these LEDs indicate that a music signal is present at the inputs.
4. OPERATION MODE LED: Shows if the amplifier is in bridge mode, stereo mode or mono mode
5. CLIP LEDS: Lit just before the maximum, distortion free, output level of the amplifier. They indicate that
the internal limiter starts working. 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!
6. AUDIO PROTECT 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, overload, short circuit, …
• While switching the amplifier off, the “protect led” turns on for a short time.ç
7. GAIN CONTROL CHA:
• BRIDGE mode: used to control the level of channel A.
• STEREO mode: used to control the level of channel A.
• MONO mode: used to control the level of channel A and B
8. GAIN CONTROL CHB:
• BRIDGE mode: NOT used.
• STEREO mode: used to control the level of channel B.
• MONO mode: NOT used
9. GAIN CONTROL CHC:
• BRIDGE mode: used to control the level of channel C.
• STEREO mode: used to control the level of channel C.
• MONO mode: used to control the level of channel C and D
10. GAIN CONTROL CHD:
• BRIDGE mode: NOT used.
• STEREO mode: used to control the level of channel D.
• MONO mode: NOT used