XP15 is a phono preamp. I would have to concur that there is a substantial positive benefit of running balanced outputs from a preamp to a Pass amp, and you can't do that with CJ.
Agree with oddiofyl about getting in touch with Spearit Sound. A first class group whose members have always provided helpful answers and advice following questions I've posed before and quite some time after I purchased my CJ Classic Sixty amp from them.
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