My father owns the Wood Quatro driven with Classe amps and Audioquest cables, and Audio Research tube pre....Pass Labs and Audio Research would probably make the short list for an upgrade when it is time to do so.
The Quatros, and their required M5HP filters, will get along well with lots of amplifiers provided they don't have too low an input impedance. I would avoid amps that have an input impedance of less than 20K per leg.
I would also seek out amps that have refinement and finesse over power.
I've heard the Quatros several times with the Ayre amps. They have always made beautiful music together. The only speaker/amp combo that have made think about trading in my Thiels.
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