This is a Rockford Fosgate Old School classic 501 power edition amplifier. Does not have end caps. These amplifiers were designed very well and do well over there rated. This one is in good condition and does work properly. The set screws and the power and ground are not original but do work and screw down tight. FREE SHIPPING I HAVE FOR FREE SHIPPING ANYWHERE IN THE UNITED STATES AND I WILL PACKAGES I AM VERY VERY WELL FOR SAFE TRAVEL SO THAT ITLL ARRIVE TO YOU IN GOOD CONDITION. 4-Ohm Load: 300 watts x 1 2-Ohm Load: 500 watts x 1 Rockford Fosgate Power 501BD 1-Channel Car Amp.

Rockford Fosgate packs the Power 501bd mono sub amp full of features and technology so you get the hardest-rockin amp around! The patented Class bd design allows this brawler to pour out up to 500 watts (at 2 ohms) with an amazing 75% efficiency rating. So get as loud as you want — youll always get smooth sound and pounding bass.Rockford Fosgate makes it simple to optimize the 501bds output with a variable low-pass crossover (50-250 Hz at 24 dB per octave); a subsonic filter improves system efficiency by eliminating inaudible, ultra-low frequencies that muddy your sound. And when youre in the mood for some truly massive low-frequency enhancement, the Punch Bass wired remote gives you drivers seat control of up to 18 dB of boost at 45 Hz.Details:300 watts RMS x 1 at 4 ohms500 watts RMS x 1 at 2 ohmsClass bd technologyrequires 4-gauge power and ground leads and a 50-amp fuse — wiring and hardware not included with amplifierselectable 50-250 Hz variable low-pass crossover, 24 dB/octaveMEHSA mounting technology increases the heat transfer from the MOSFET output devices to the heat sink, for higher power output, lower operating temperatures, and greater reliabilityTOPAZ noise-killing differential inputs eliminate 80% of ground loop noisepreamp outputs for easy connection to a second amplifiersubsonic filter removes frequencies below 20 Hz for increased efficiencybd Sync — allows two identical Class bd amps to be tied together to power one subwoofer (using an optional cable)13-1/8W x 2-3/8H x 9-7/8

Rockford Fosgate packs the Power 501bd mono sub amp full of features and technology so you get the hardest-rockin amp around! The patented Class bd design allows this brawler to pour out up to 500 watts (at 2 ohms) with an amazing 75% efficiency rating. So get as loud as you want — youll always get smooth sound and pounding bass.Rockford Fosgate makes it simple to optimize the 501bds output with a variable low-pass crossover (50-250 Hz at 24 dB per octave); a subsonic filter improves system efficiency by eliminating inaudible, ultra-low frequencies that muddy your sound. And when youre in the mood for some truly massive low-frequency enhancement, the Punch Bass wired remote gives you drivers seat control of up to 18 dB of boost at 45 Hz.Details:300 watts RMS x 1 at 4 ohms500 watts RMS x 1 at 2 ohmsClass bd technologyrequires 4-gauge power and ground leads and a 50-amp fuse — wiring and hardware not included with amplifierselectable 50-250 Hz variable low-pass crossover, 24 dB/octaveMEHSA mounting technology increases the heat transfer from the MOSFET output devices to the heat sink, for higher power output, lower operating temperatures, and greater reliabilityTOPAZ noise-killing differential inputs eliminate 80% of ground loop noisepreamp outputs for easy connection to a second amplifiersubsonic filter removes frequencies below 20 Hz for increased efficiencybd Sync — allows two identical Class bd amps to be tied together to power one subwoofer (using an optional cable)13-1/8W x 2-3/8H x 9-7/8