Even at very high listening levels, Hifonics Super A/B Class™ circuitry results in a smooth and linear high end with lower distortion, plus higher current efficiencies and less heat buildup. POWER @ 1 OHM (CH X WATTS): N/A.
eBay
6800W high-power car amplifier can effectively improve the sound quality of car and bring a nice experience to users. 4-channel and high-power car amplifier can effectively improve the sound quality of car and bring a nice experience to users.
eBay
Pioneer GM-A6704 Car Stereo Radio 1000 Watts Max 4-Channel Bridgeable Car Amplifier. From dramatic distinction to dramatic design, Pioneer's new GM-Series amplifiers are thrillers in every sense, pushing the limits of flexibility and functionality.
eBay
Quick thermal dispersion technology aluminum heat sink. Variable high-pass filter: 40 - 400 Hz. Variable low-pass filter: 40 - 400 Hz. 4 ohm: 250 watts x 4 channel. 2 ohm: 500 watts x 2 channel. Bridged: 1000 watts x 2 channel @ 4 ohm.
eBay
Bought for a project, ended up not using it.
eBay
Car Amplifier Pioneer GM-A4704 4 Channel 520 W  yeah For Sale is amplifier in full working condition taken out of my vehicle as I no longer have any use for it sounds great and it’ll be a nice addition to someone’s vehicle only questions do not have a look to ask please look at pictures before purchasing as I do not do refunds, 
eBay
VIBE Powerbox65.4 Car Audio 520W Amp Plug & Play Amplifier for BMW 5 Series E60. A - A channel of an amplifier is for one output, for example a 4 channel amplifier will allows 4 separate products (or more if linked together) so a 4x65 watt amp gives 4 outputs of 65 watts.
eBay
Peak Output Power: 8800W. Item: 4 Channel High Power Amplifier. High Level (speaker) / Low Level (RCA) Input. This item have 3 months warranty. Good communication is helpful for both of us to resolve any problems and issues.
eBay