Funny you should ask this question, since I have heard the PV-10a (my ex-wife has the line stage version, and I got to audition extensively in my system a while ago) and just added the A3cr last week. My memory of the CJ was of a warm, slightly fat sound (which didn't work well at all with my speakers -- Apogee Duetta Sigs). I though it was very musical, but I prefered an MFA Magus in my system (more of a classic Audio Research sound than a CJ sound). My sense is the the A3cr is less warm than CJ, but still very rich sounding in terms of the entire harmonic spectrum. Voices aren't quite as fully-embodied (and bloomy) as with a tube preamp, but they are probably much more realistic. I don't remember much about the low end on the CJ, but the A3cr goes very deep (though not as amazingly deep as the Sonic Frontiers Line 1 I auditioned a couple of years ago). The remote control is ok (I much preferred the Sonic Fronters "hockey puck" to the MF) but doesn't appear to have the greatest range -- maybe 15-20 feet.
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