it's a standard solid high power(voltage) amp. the ones that you saw being run down in the 1/4-1/8 ohm load, are known as "high current(hc)" amps. these amps have mehsa boards, meaning all the fets on one side are actually soldered down to aluminum plates, making it a real pain to repair. there is also a difference in the power and punch amps, other than the name. they look identical until you actually test them, iirc. the 800.2 IS a 800a2. same exact amp, with new case and fancy "2400watt" badge. there was also the 801s run with the 800.1, which was the same, but the torroid was wrapped a little different