Hertz and Audison are the same brand. Audison amps are very good. Some models can run in Class-A depending on module selection; which makes them sound great for mids and highs. They run hot however by design due to their Bi-Polar output stage (instead of mosfet) with a higher voltage bias (Making them sound warm; class-A) and are not the best for powerful subwoofers.
For the win, the only other amps in this category are old SoundStream Class-A, MCx, and some Reference/Rubicon amps built in the US back in the early 90s, and similar amps using TIP101/107 output devices. I think the old SoundStream stuff is still probably better, but Audison amps are very good and easier to get - new stuff. Is the Hertz amp in the same as the Audison line?
I have an old Soundstream Reference 1000sx which I will sell for $300 shipped. Works flawless and one of the best sounding mass-produced amps ever.
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