I've owned an Amp 2 and Amp 3 for about 15 years, and they have been in continual use without any problems, first driving KEF 102/2s and 100 C, now driving a pair of KEF 104/2s, a pair of 102/2s, and a 200 C. They're absoletely silent absent signal, and I've never sensed a lack of headroom. I also own a troublefree PAV and PDSD.
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