I have used the Cadence A7HC the Z9000 and the Q3000. All three amps have been of fantastic quality, sound great, have a very non intrusive clip[ping stage and put out rated power. I had the A7HC tested and it put out 1328 watts at 13.8v reactive. I have beat the living crap out of the Z9000 and A7HC and they never have even gotten warm to the touch. Match all that with 24 DB crossovers, and some good looks, and you have some fantastic amplifiers.