I was using a 150 watt into 8Ω Proceed Amp 2 that I've have for decades. It replaced a 250 watt into 8Ω Parasound A 21 that was too large to fit into the cabinet. The K-5xeMP preamp replaced a Cary Cinema 12 prepro, and that had much more effect on sound quality than the change in amps. I use a Beveridge RM-3 with 100 Hz high- and low-pass cards of fixed filter characteristics -- I use only low-pass to the subs when running the Ayre amp, but both high and low pass when running Cary CAD 572 SE monoblocks. Charles Hanson strongly advised against putting anything between the Ayre preamp and the amp.
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