Ayre QB-9 DSD (upgraded from the original Ayre QB-9) I've been upgrading my Ayre with SR fuses (current Blue) and added the Uptone Audio ISO Regen with the LPS 1.2 linear power supply. I also put an Akiko tuning stick in one of the Ayre XLR inputs. It's very neutral and transparent without sounding cold. Audirvana Plus is 100% compatible with my DAC and the upgrades. I'm running my Ayre DAC through an ASR Emitter II Exclusive amplifier and through a pair of Quad 2905 ESL's.
I should have mentioned probably one of the best bargains for a dac, the Monarchy NM24. People don't go after it because the name doesn't impress their friends but that thing runs PCM-63's and I have owned it before.
Actually, the NM24 used the 1704. It is the M24, which I have, that uses the 63.
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