Blue Collar Audiophile
That PPI Atom I tried was "dirty power". To be honest the pair of Italian twins I'm running now are the best amps I've ever run at any price point. They'll pound the hell out of subs just as well as they can run amt tweets. The only other amps I've run that stood out were my old Crossfire VR series amps. Those things were tanks and you could clip them a little before the output got "dirty". More of a slight taper than a brick wall. My PG Xenon amps were "brick wall clippers". As for "clean power", in my opinion an amp made with quality close tolerance parts has a lot better chance of sounding "clean" than an amp made with the cheapest parts money can buy. I've learned the hard way with many products that you can spend your money up front or you can spend it little by little over time until eventually you end up spending enough to have bought what you wanted in the first place several times over. In other words, buy what will fit your needs, save your money for a few more months if needed, and you'll end up appreciating what you got even more. IN NO WAY AM I SAYING THAT HIGHER DOLLAR AMPS ARE ALWAYS BETTER, but if the build quality reflects the price I bet it has a much better chance of doing the power it's rated to do without falling on its face. The biggest gripe I've had with most cheaper amps is they're like an engine without sufficient torque. Can't have one without the other.