I should add, by the way, that there are additional reasons for buying
better built amplifiers. But none that I can think of that directly relate
to "clean" vs. "dirty" power. For instance, when you're driving low
impedance loads, some amps crap out sooner than others. When you're driving
an amp to its limits, some overheat and shut down. "Better" amps often
don't. But I think you'd be quite surprised to find that there are some
pricier amplifiers that are less stable under these circumstances than
others. For example, I've had a tougher time with Profile amps overheating
than Jensens, yet the general concensus among car audio groups is that
Profile amps are supposedly "mid grade" whereas Jensens are "junk". I'd
actually put some of the newer Jensen amps up against Kenwood, Profile,
Sony, Audiobahn, Alpine, etc in terms of reliability.