Rockford Fosgate M400-4D Installation & Operation Manual page 5

Crossover Switch
Selectable switch for Low-Pass (LP) or
All Pass (AP) or High-Pass (HP)
Input Switch
Setting this switch to the connected inputs aligns the
output signal accordingly or can supplement signal to
additional channels when not connected.
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Design Features
Gain Control
The gain control is used to match the output of the
audio source.
Punch EO - Selectable
This selectable control works along with the
crossover switch on the amplifier, boosting the
bass frequencies.
Remote Punch level Control
Remotely control the subwoofer output
level of the amplifier.
High level Inputs - Optional Inputs
Accepts High Level speaker signal when utilizing
the 4-pin Molex harness provided.
RCA Input/Pass-Thru Jacks
The RCA Inputs/Pass-Thru Jacks are nickel-plated to resist the signal degradation
caused by corrosion. The Pass-Thru provides a convenient source for daisy-chaining
an additional amplifier without running an extra set of RCA cables from the front of the
vehicle to the rear amplifier location.
illus.-1.1
5