welll sinergy from Passlab (X or XA serie) and Aresearch Ref5se is from long time presentin more passlabs system. This is sure.
a Xp20 is anyway a great preampli. try! a Xa100.5 (in this case) -> "as a tube powerampil sound" with another preampil tube can be a little "soft, too mushy"
but is without doubt a good combo.
for me is like a Mcintosh Mc452 with a C2500 =good vs. C2500 and Mc275 uhmmm sound can be "mushy"...
ref5 and Xa passlabs is the same.
Xp20 and Xa passlabs ove the paper is better....but before listen yourself....
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