I assume OP has a Proceed HPA 3, a very nice amp. I replaced my HPA 3 with a pair of Parasound JC 1 monoblocks, because I wanted to match a JC 2 preamp. The JC 1s did substantially extend the useful LF range of my KEF Reference 107/2s down to 20 Hz. If OP has the smaller Amp 3, that's a different matter.
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