Operating Elements; Protection Circuit - Crunch GROUND POWER GPX2200.1D Manual De Uso

OPERATING ELEMENTS

INPUT SENSITIVITY
Turn the GAIN (Fig. 1,3) controller of the amplifier to the MIN position. Then turn the volume controller of the
head unit to 80 - 90% of its full setting. Now turn GAIN clockwise until you hear some distortion. Then turn back
the GAIN slightly until you hear a cleaner sound.
PHASE SHIFT CONTROLLER
The PHASE SHIFT controller (Fig. 1,4) allows to adjust the phase between 0° and 180° to match the output
signal with the vehicle's interior acoustic.
VARIABLE SUBSONIC FILTER
With the SUB SONIC controller (Fig. 1,5) you can adjust the lower crossover frequency, to filter the very low
frequencies to relieve the subwoofer or to generate a bandpass signal. If you don't want to use this function,
turn the controller (Fig. 1,5) to the very left to the 10 Hz position.
NOTE: The adjusted value of the SUB SONIC (Fig. 1,5) should not be higher than the adjusted value of the
LPF controller (Fig. 1,6). Otherwise no sound will be audible.
VARIABLE LOW PASS FILTER
Set the desired crossover frequency by using the controller LPF (Fig. 1,6). Thus to that only the frequencies
below the chosen crossover frequency will be amplified and the subwoofer plays more precisely and efficient.
VARIABLE BASS BOOST
With the bass boost controller (Fig. 1,7) you are able to adjust the bass level from 0 - 12 dB.
Attention: Use the BASS BOOST wisely!
BASS LEVEL REMOTE CONTROLLER
With the included bass level cable remote controller you are able to adjust the bass level e.g. out of the driver's
seat.
MASTER/SLAVE OPERATION
The MASTER/SLAVE Operation allows to link two identical GPX2200.1D amplifiers. The advantage of this
function is, that the crossover section of amplifier 2 will be bypassed and for both amplifiers the same cross-
over settings come into operation, which can be adjusted on the MASTER amplifier. Then both amplifiers
work together as one big monoblock. Please refer to section "MASTER/SLAVE OPERATION WITH TWO
GPX2200.1D" on page 11 and the figures 5a to 5c on the very last page.

PROTECTION CIRCUIT

The POWER/PROTECTION LED (Fig. 1,9) lights up green, if the amplifier is in operation.
The POWER/PROTECTION LED (Fig. 1,9) lights up red, when the amplifier is overheated, or a short circuit
occurs resp. a too low impedance load is connected to the speaker outputs. If this events, the internal built-in
protection circuit shuts down the amplifier automatically. The amplifier should work again properly after you
have solved the problems.
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