Channel Amplifier - Applications; One 4 Channel Amplifier In Mono/Subwoofer Mode With Two Subwoofers - Crunch GP1000.2 Owner's Manual

One 4 Channel Amplifier in Mono/Subwoofer Mode with two Subwoofers

X-OVER SELECT (CH1/2 & CH3/4)
• In Mono/Subwoofer-Mode select the Lowpass-Position (LP), which eliminates the higher frequencies. The recommended
crossover frequency ranges between 60 - 100Hz, depending on the size and response of the Subwoofers. The Lowpass
adjustment can be done with the FREQ - ADJUST control.
INPUT LEVEL (CH1/2 & CH3/4)
• Turn the INPUT LEVEL controls on the amplifier to 5V position.
• Turn the head unit volume control to about 80-90% of its full setting.
• Turn the INPUT LEVEL controls clockwise until you hear some distortion.
• Then turn back the INPUT LEVEL controls slightly until you can hear clean sound.
BASS BOOST (CH1/2 & CH3/4)
• The BASS BOOST - Control increases the bass level at 45 Hz max. +12dB.
Caution! Please use the Bass-Boost carefully. The additional boost may result in clipping or overload.
MODE SELECT
• The MODE SELECT - switch from CH1/CH2 must be in "2" - position and the MODE SELECT - switch from the CH3/CH4
must be in "MONO" - position.
Connect RCA outputs from head-unit with
RCA inputs (INPUT CH1/2).

4 Channel Amplifier - Applications

GP1000.4 / GP1500.4
Interconnect cable checklist:
• Connect the head unit line outputs with good quality RCA to RCA cables to the INPUT
CH1&2 of the amplifier.
• Connect the Subwoofers with the terminal blocks (SPEAKER OUTPUT / + BRIDGED -
from Channel 1&2 and + BRIDGED - from Channel 3&4) of the amplifier.
•The minimum final speaker impedance must not be below 4 Ohm per channel pair. Too low
speaker loads result in too high heat dissipation and may cause the amplifier run into
protection.
• Please observe speaker channel and polarity as printed by the speaker terminal block.
Incorrect phasing of the speakers results in total loss of bass response.
Be careful not to connect speaker (-) to the ground or vehicle chassis.
Caution
Subwoofer 4 - 8 Ohms
Subwoofer 4 - 8 Ohms
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