Operating Elements; Master/Slave Operation; Input Sensitivity - Crunch groundpounder GPX2000.1D User Manual

SUBWOOFER CONNECTIONS
- The total loudspeaker impedance should not be lower than 1 ohm.
- 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 stereo signal connected to LINE INPUT (Fig. 1,3) will be routed in summed to the output jack OUT
(Fig. 1, 2b). This connection is suited to drive another identical GPX2000.1D amplfier at its input jack
(Fig. 1, 2b). Please check for this mode the section "Master/Slave Operation" on the bottom of this
page.

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. 1,5) until you have an average
medium level. This setting usually provides sufficient power reserves at optimum weighted noise voltage.
VARIABLE LOWPASS FILTER
Set the desired crossover frequency of the low pass filter by using the controller (Fig. 1, 6). Thus to
that only the frequencies below the chosen crossover frequency will be amplified and the subwoofer
plays more precised and efficient.
VARIABLE SUBSONIC FILTER
The subsonic filter is suited to filter the lower frequencies out from the audio signal to avoid unwanted
hum noises from the subwoofer. Set the desired crossover frequency of the subsonic filter by using
the controller (Fig. 1, 7). Thus to that only the frequencies above the chosen crossover frequency will
be amplified and the subwoofer plays more precised and efficient.
VARIABLE BASS BOOST WITH VARIABLE FREQUENCY CONTROLLER
By using the bass boost controller (Fig.1, 9) you are able to increase the bass boost level from 0 dB to
12 dB. Use the frequency controller (Fig. 1,8) to set the desired frequency for the bass boost level. The
frequency range goes from 30 Hz to 80 Hz.
Caution: Please use the bass boost with care. A too high bass boost may result in serious damages
on the subwoofer.

MASTER/SLAVE OPERATION

The Master/Slave Operation allows to link two identical GPX2000.1D amplifiers. This means you can
connect the in- and outputs of both amplifiers (Fig. 1, 2a and 2b) by a RCA patch cord. Amplifier 1
(Master) sends a summed mono signal to amplifier 2 (Slave). The advantage of this function is, that
the crossover section of amplifier 2 will be bypassed and for both amplifiers the same crossover settings
come into operation, which can be adjusted on the amplifier 1. Then both amplifiers work together as
one big monoblock.
Please observe therefor the section "MASTER/SLAVE OPERATION (Fig. 5) WITH 2 GPX2000.1D on
page 12 and the figure 5 on the very last page.
ENG
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