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I think they'll find building a clean low power amp on the cheap is not too hard.
Building a clean high power amp, much harder. You need more the just an amplifier IC, your power supply also needs be clean and capable of handling large surge current. That usually requires expensive transformers and capacitors. Also, at high power outputs, cross talk and feedback become issues, so sheilding and a carefull pcb layout also come into effect. Again, not cheap.
So, after all that, you may find that the peformance of the more powerful amps built on the cheap un-do everything gained by the new amplifier technology.
Only one way to find out though.
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