Hifonics Vulcan VXi9404 Owner's Manual page 21

The CH3/4 BASS BOOST controllers adjust the bass boost enhancement continuously from 0dB to +12dB at 45 Hz for
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channel 3/4.
The CH1/2 and CH3/4 HP controllers adjust the cut-off point of the frequency range to below for the relevant channels (Channel
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1/2 or Channel 3/4). The cut-off frequency is continuously adjustable from 10 Hz to 1200 Hz (1.2 kHz).
The LEVEL CH1/2 and CH3/4 controllers adjust the input sensitivity of the amplifier, to adjust the audio signal of the head unit at
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the relevant channels (Channel 1/2 or 3/4). The input sensitivity is adjustable from 6 Volts (MIN) to 0.2 Volts (MAX).
The LINE INPUT RCA jacks must be connected with the RCA output jacks of the headunit.
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When you only use the jacks CH1/2, the INPUT MODE switch must be set to 2CH position.
The LINE OUT RCA jacks provide a linear fullrange audiosignal to supply an additional amplifier.
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NOTE
Installation of RCA/Audio signal cables and power supply cables.
Ensure while installation not to lead the audio cables between the head unit and the amplifier together with the power supply wires
on the same side of the vehicle. The best is a real separated installation on the left and right cable channel of the vehicle to avoid
interferences on the audio signal. This stands also for the enclosed bass-remote wire, which should not be installed together with the
power supply wires.
FUNCTIONAL INSTRUCTIONS
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