Focal IMPULSE 4.320 Manuel D'utilisation page 24

IMPULSE 4.320 AMPLIFIER
U s e r m a n u a l
24
4 - Control panel and connections
fig. 11
INPUTS: These connectors are dedicated to the low-level and high-level signal inputs.
GAIN (FRONT AND REAR): The GAIN knob allows you to adjust the incoming signal to the amplifier. The
voltage gain varies between 0.2V and 5V. To optimise the performance of your sound system, you need to
apply a maximum of gain as early as possible in the stereo system, and then a minimum of gain afterwards.
This knob must be set according to the source volume (line output level).
Start by setting the amplifier gain to its lowest level. Gradually increase the level of the source volume up to 3/4
of the way. Then increase the amplifier gain to the desired maximum listening volume. Turn the volume down if
distortion occurs. The FRONT knob controls the front speaker drivers. The REAR knob controls the rear
speaker drivers.
+12V: the "+BATT" power connector is dedicated to the power cable connecting the amplifier to the positive (+)
terminal of the battery.
GND: the GND (ground) power connector is dedicated to the negative (-) power cable connecting the
amplifier and the vehicle's chassis.
REM: the REM connector connects the amplifier to the source (head unit) via a REM or REMOTE output
on the head unit. This enables the amplifier's automatic power on function when the source (head unit)
is turned on.
POWER and PROTECT: these LEDs enable you to check if the amplifier is working correctly.
A continuously lit POWER LED means the equipment is working correctly.
If the PROTECT LED is continuously or intermittently lit, the equipment is not working correctly. See
troubleshooting section paragraph 5.
INPUTS LEVEL: this switch selects the type of input level (HIGH: high-level / LOW: low-level RCA)