We (MTX AUDIO) build some of our amps in our Arizona factory. Some other are built in OUR China factory that we own 100%. We do not source our amps and in fact build some other peoples products (amps / subs) also. If Anyone is ever in Arizona I would be happy to give a tour of the factory and show you around Magnum Sales as we are in the same building as MTX and my family owns both companies. Next time I'm going to show Mark our R&D and how we design our Amp and Subs. BTW MTX 8500 and MTX 9500 subs are all built in the USA also Mark and I are going to do a little demo for each other BTW I hated my MTX 8000 subs too BUT that was 8 years ago the 9500 rock now. Pontiac made the Aztec, Cadillac made the Catera and MTX made the 8000 We all have our occasional failure.