Just the one. I can't imagine needing more power. I think if I were willing to spend north of $10k on amps, I'd be looking at Pass Labs monos. Truth is, the A21 was plenty... I'm looking to the JC5 for the improvement in SQ and the little extra class-A headroom (7.5 vs 12w). My speakers are pretty efficient so 12w should be plenty for normal listening.
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