Crunch GPA1000.1, Instruction Manual, Page: 8 / 14

6
Basic application
These sub bass amplifiers can be used in any of the bi-amplification systems described in
this manual, replacing the 2 channel amplifiers as per the illustrations.
Connect the inputs to a suitable source, e.g. a head unit with good quality RCA cables.
Connect the LINE OUT to the inputs of the system highs amplifier.
Use at least #12 gauge speaker wiring. The amps have dual speaker terminals,
simplifying the hookup of multiple speakers
Refer to the section
Interconnect cable checklist:
Crossover frequency control checklist:
LOW PASS: 40Hz to 150Hz
SUBSONIC:15 Hz to 55 Hz
BASS EQ: 0 to +9dB
Level control checklist:
Minimum final loudspeaker impedance: The GPA1000.1 & GPA1500.1 are 4 & 2-
Ohm stable only (not 1-Ohm stable).
The GPA200.1 & GPA3000.1 are 4, 2 & 1-Ohm stable.
“Setting up systems after installation for best performance”
FULL RANGE
STEREO LINE INPUT
NOT USED
Y-ADAPTOR
Note: You can use the Radio/CD designated mono line output or a full range stereo line output.
For full range stereo line output, you will need an optional “Y-Adaptor” as shown.
GPA1000.1 / GPA1500.1 / GPA2000.1 GPA3000.1 1 CHANNEL APPLICATION
PARALLEL MONO
SUBWOOFERS
2- OHMS EACH MINIMUM
MONO
SUBWOOFER
REMOTE TURN-ON
CHASSIS GROUND
TO B 12 Volts VIA FUSE
DESIGNATED
MONO OUTPUT
FROM HEAD UNIT