Loudspeaker Connections; Operating Elements; Input Sensitivity - Crunch Groundpounder GPX500 .2 User Manual

LOUDSPEAKER CONNECTIONS

- In 2-channel operation (i.e. one loudspeaker on each amplifier channel), the impedance must
not be lower than 2 ohms for each speaker
- In bridging mode (two amplifier outputs combined) the impedance must not be lower than 4 ohms
for the bridged output.
- Never connect loudspeaker cables with the ground of the chassis or the +12 V supply voltage.
If the amplifier is operated with a too low impedance or incorrectly used, the entire sound system
may be damaged. This means a warranty void in such cases.
SIGNAL OUTPUTS TO CONNECT ADDITIONAL AMPLIFIERS
The input signal on the IN jacks (Fig. 1,5) will be routed in stereo to the output jacks OUT (Fig. 1, 4).
Thus the OUT jack allows the connection of a additional amplifier.

OPERATING ELEMENTS

INPUT SENSITIVITY

The input sensitivity can be adjusted to any headunit. Turn the volume control of your headunit to the
center medium position and then adjust the input level controls (Fig. 1,8) until you have an average
medium level. This setting usually provides sufficient power reserves at optimum weighted noise voltage.
VARIABLE HIGHPASS FILTER
If the amplifier is to be used for satellite loudspeakers (mid-range/tweeter loudspeakers), set the switches
(Fig. 1,2) to "HPF" or for bigger loudspeakers (>20 cm) to "FULL". Set the desired cross-over frequency
on controller (Fig.1, 1). Thus to that only the frequencies above the chosen cross-over frequency will
be amplified. This effectively minimizes distortions and overloads at lower frequencies. A good point
to start is at 125 Hz.
VARIABLE LOWPASS FILTER
If the amplifier is used to drive a subwoofer, set the switch (Fig. 1, 2) to "LPF". Set the desired cross-
over frequency by using the controller (Fig. 1, 3). Thus to that only the frequencies below the chosen
cross-over frequency will be amplified and the subwoofer plays more precised and efficient.
SWITCHABLE TREBLE BOOST
By using the bass boost switch (Fig.1, 6) you are able to increase the treble level by 6 or 12 dB at 20 kHz.
SWITCHABLE BASS BOOST
By using the bass boost switch (Fig.1, 7) you are able to increase the bass level by 6 or 12 dB at 45 Hz.
ENG
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