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4 HIGH PASS:
Set the crossover switch 2 to HP and turn this control to 65Hz or above when using speakers smaller than
6 x 9”. This feature is designed to filter out all low bass frequencies that only subwoofers should produce.
Note: Failure to do so could result in speaker damage.
5 BASS BOOST:
This is a variable control to increase the bass boost at 45Hz from 0-+12dB of gain. Adjust to suit.
6 SUBSONIC:
This is a variable control that filters out all sub bass frequencies below the set point at 12dB/Octave.
7 LEVEL:
This allows level adjustment of the input signal. Use this control to correctly match the head unit to the
amplifier. To set this control correctly, turn the amplifier level to MIN and the head unit to 3/4 volume, with
the bass and treble on zero, then slowly turn up this amplifier level control towards the MAX end of the
control. Note: If the sound becomes distorted, turn this control down.
8 FRONT RCA INPUT:
Connect these RCA connectors to the front low level output connection from the headunit.
9 REAR RCA INPUT:
Connect these RCA connectors to the rear low level output connection from the headunit.
10 RCA OUTPUT:
Use these RCA output connectors to connect to a secondary amplifier.
11 GROUND INPUT:
Connect directly to the vehicle’s chassis via an 4 gauge power cable.
Note: This is the first wire to connect when wiring up an amplifier. Damage could result if this is not done.
12 REMOTE INPUT:
This terminal is for turning the amplifier on and off. The remote input requires a switched positive (+12V) to
power ‘ON’ the amplifier. This can be found on the rear of the head unit in the form of a electric antenna
output, or a remote on output. If not available you can wire to the ACC position on the key.
13 12V INPUT:
Connect directly to the vehicle battery positive (+) terminal via an 4 gauge power cable and with an inline
fuse or circuit breaker at the battery end.
Note: This is the last wire to connect up during installation, damage could result if this is not done.
14 FUSES:
Please ensure the correct type of fuse is fitted, as specified in this manual.
Note: the NV-AM20004 has 3 x 40A fuses.
15 SPEAKER OUTPUT:
See 4/3/2 channel installation diagrams on page 30 for correct speaker connection.
