sound quality is the best in the biz. very warm sound.and a very powerful amp.

none i know

this amp is the best. ive personally used zapco amps for years including the new c2k 6.0x. but i still go back to this amp. the sound is just different very warm and dont even start with the quality. its just amazing what this amp can do. so for you folks that havent heard the champion series yet, too bad cause they are long gone in the market and good luck finding one. and for you guys that have it. enjoy the amp and dont run it under 1 ohm, tnx

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