Were the B&W 803s the Diamond series?? I have heard these driven with 38W/ch.If Matrix or Nautilus,then the tubes were having trouble with the impedance/crossover.
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Never heard the VAC, but own a MC275 (essentially the same amp section of the MC2275) with B&W 804S (smaller than the 803S) and it has NO issues whatsoever driving these speakers. Actually I have a SS 200 Wpc amp sitting around and was considering biamping, but decided the 275 bass was good enough for me.
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