Focal IMPULSE 4.320 Gebrauchsanleitung Seite 13

IMPULSE 4.320 aMPLIfIEr
U s e r m a n u a l
INPUT SELECT: this switch enables channels 1 and 2 to be played through channels 3 and 4.
If you only have one output (one right and one left), you can still amplify the four channels by activating the 1/2 mode.
If you want to use the IMPULSE 4.320 with its independent 4-channel input configuration, select mode 3/4.
If you want to use the IMPULSE 4.320 with a 3-channel configuration, select mode 1+2. Channels 3/4 will then receive
the mono signal from channels 1 and 2 to drive your subwoofer.
PHASE (°): the PHASE knob enables you to adjust the channel phase according to the rest of the installation.
Adjusting the phase of the subwoofer enables the subwoofer output to be in phase with the other speaker drivers. On
a theoretical period of a signal, one of the sources can be delayed slightly so that the phase will be perfectly balanced
at the listening point.
X-OVER MODE: the crossover mode switch enables you to choose to activate the high-pass filter mode (HPF), the
low-pass filter mode (LPF) or the full range mode (FULL) for channels 3/4 or rear channels.
X-OVER FREQ (Hz): this knob controls the cut-off frequency by adjusting the low-pass and high-pass filter levels. The
selected value determines the frequency up to which or from which the signal will be cut off.
FRONT CH. (1/2): this switch activates a high-pass filter set at 75Hz for the front channels. Use this setting for solving
issues related to door vibrations in vehicles not equipped with vibration dampeners.
5 – Troubleshooting
The state of the various LEDs indicates a malfunction or the source of a malfunction.
Check the possible causes shown below. If, despite these checks, the equipment is still not working correctly, contact
your IMPULSE 4.320 amplifier installer or dealer.
State of LEDs Presence of
sound
PROTECT
lit red
Off
Off
Off
Off
POWER YES/NO
flashing green Or intermittent
Possible cause
NO Output short
circuit
NO No power or
poor
connection
NO Overheating
NO No REM signal
NO Fuse
malfunction
Grounding
defect
Turn off the sound system.
Check the speaker drivers, their minimal impedance,
their connections and the speaker driver cables.
Turn off the sound system.
Check power source is 12V.
Check the power cables and their polarity.
Check the fuses.
Turn off the sound system.
Wait for your amplifier to cool down before resuming use.
Turn on the sound system.
Check there's power on the REM terminal.
Turn off the sound system.
Check and replace the fuses if necessary.
Turn off the sound system.
Check the connection from the GND terminal
to the chassis of the vehicle.
Action
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