Rockford Fosgate 400-4
4-channel car amplifier
50 watts RMS x 4 at 4 ohms (100 watts RMS x 4 at 2 ohms)
200 watts RMS x 2 bridged output at 4 ohms (4-ohm stable in bridged mode)
Dynamic Thermal Management cooling system
variable high- and low-pass filters (50-500 Hz, 12 dB/octave)
variable bass/treble boost (0-18 dB at 45 Hz, 0-12 dB at 12,000 Hz)
optional wired remote bass/treble boost
Class-AB amplifier design
MOSFET power and output stages
4-gauge power and ground leads and an 80-amp fuse recommended — wiring and hardware not included with amplifier
no on-board fuses — when installing multiple amps in a system, an additional 80-amp in-line fuse between the distribution block and the amplifier is recommended
13-1/16"W x 2-5/16"H x 8-11/16"D
RMS Power Output (Watts x Channels) 50 x 4
Peak Power Output (Watts x Channels) 415 x 4
Power at 2 Ohms (Watts x Channels) 100 x 4
Bridged Power (Watts x Channels) 200 x 2
Minimum Impedance Bridged 4
Minimum Impedance Unbridged 2
Best Frequency Response 20-20k Hz
THD at Rated RMS Power 1%
Signal to Noise Ratio 85 dB
Input Voltage 14.4v
Amplifier Class AB
Low-Pass Crossover Frequency 50-500 Hz
Low-Pass Slope (dB/octave) 12 dB/oct
High-Pass Crossover Frequency 50-500 Hz
High-Pass Slope (dB/octave) 12 dB/oct
Bass Boost 0-18 dB
Bass Boost Frequency 45 Hz
Fan Cooled No
Fuse Rating In-line 80 amp, not included
Speaker Level Inputs No
Preamp Outputs No
LED Power Indicator Yes
Width (inches) 13-1/16
Height (inches) 2-5/16
Depth (inches) 8-11/16
This amp is in great condition, the glossy finish could use a little cleaning but nothing huge, a few bits of residue and a few small scratches only visible in certain lighting and from certain angles. A few marks on the bottom. I'd say 9/10. Also, this amp is physically tiny. I don't have the birth sheet anymore, but it birthed out at something over 70x4 RMS, it was either 72 or 79. I searched through about 5 of them for the one with the highest output. Only selling because I found a matching amp to my sub amp and haven't used it since.
$165+ shipping OBO
Sorry for the low quality cellphone pics
Size comparison of it and the box for the AVIC-U310BT. Yes, it really is tiny.
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