I have heard the Krell, Arcam, and several MF amps but not the A5. General impressions - the Krell is more dynamic, solid bass and capable of driving about any speakers. Arcam is a more transparent and refined sound but not as strong in the lower registers. Musical Fidelity is a more fluid sound, without any glare or harshness. It is warmer than the Arcam and much warmer than the Krell. A lot depends on the type of music you listen to and the speakers it will be driving. For a low efficiency speaker, I'd probably opt for the Krell. The most musical sounding is probably the MF.
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