Design Features - Rockford Fosgate M400-4D Installation & Operation Manual

4
Design Features
Variable Phase
The variable 0-180° phase control allows the listener
to change the arrival time of the subwoofer sound
waves relative to the same frequencies from the main
speakers.
Variable Crossover
built-in 12dB/octave Butterworth filter with a crossover A
po
10
cro
int variable from 50Hz to 250Hz. (M750-1 D & M1200-
have an additional 12dB/octave Infrasonic filter with a
ssover point variable from 15Hz to 40Hz SS)
PUNCH EQ. FRE . Hz
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Power/Protect LED
. Protect/
or short
Power LED illuminates blue when the unit is turned on
Thermal LED illuminates red when amplifier overheats
circuits. The amplifier will automatically shut down if thi s occurs.
e
Punch EQ - Variable
This variable control wor ks along with the crossover
switch on the amplifier, boosting the bass frequencies.
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GND REM B+
Power/REM Terminals
The Power and Ground Terminals are nickel-plat-
ed set-screw wire connectors and will accommo-
date 4 AWG . The REM Terminal is a nickel-plated
set-screw wire connector and will accommodate
8AWG.
@ ~ (©) RIGHT
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BRIDGED
SUB
REAR
Speaker Terminals
The Speaker Terminals are nickel-plated
set-screw wire connectors (+and -) will
accommodate 8 AWG.
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