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

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ESIGN EATURES
1. Power/Protect LED – Power LED illuminates blue when the unit is turned on. Protect LED
illuminates red if a short circuit or to low of an impedance is detected at the speaker connections.The
amplifier will automatically shut down if this occurs.
2. RCA Input Jacks – The industry standard RCA jacks provide an easy connection for signal level input.
They are nickel-plated to resist the signal degradation caused by corrosion.
3. RCA Pass-Thru Jacks – This 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.
4. Gain Control – The input gain control is preset to match the output of most source units.
5. Crossover Switch – Selectable switch for High-Pass (HP),All Pass (AP), or Low-Pass (LP) operation.
6. Variable Crossover – Is a built-in 12dB/octave Butterworth filter with a crossover point variable
from 50Hz to 250Hz.
7. Punch EQ – A Gyrator based Punch EQ that eliminates frequency shift with boost.This works along
with the crossover switch on the amplifier.When set to Low-Pass (LP) operation, this control is a narrow
band adjustment variable from 0dB to +18dB @ 45Hz.
8. 2/4 Channel Switch – Setting this switch to the 2CH. position, switches the inputs to a 2-channel
mode, allowing connection to only the front inputs with a 4-channel output.
9. Speaker Terminals – The heavy duty, nickel-plated set-screw wire connectors ( + and -) will
accommodate 8 AWG.
10. Power Terminals – The power and ground are nickel-plated set-screw wire connectors and will
accommodate 4 AWG.
11. REM Terminal – The nickel-plated set-screw wire connector and will accommodate 8 AWG.This
terminal is used to remotely turn-on and turn-off the amplifier when +12V DC is applied.
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