I am not sure how well my Prologue Two will match with differ speakers, but when I auditioned Prima, for the first time, Sonus Faber Auditor M monitors sounded simply wonderful, CD player was Ayre CX7E. Then I paired my Canton CD100 with it and was blown away, never thought such sound can be produced from speakers like this. I already rolled pre amp section tubes and the sound become less lush/tuby, but more open, airy and detailed without loosing the musicality. Right now looking for some KT88 upgrade, which possible, bring this baby to the next level. Speaking of power tubes rolling, its endless: KT88,6550, KT90, EL-34, KT77, 6CA7, 6L6GC, KT66, 7581, EL37, and any of their equivalents. Means, you can tune the sound to your liking. Of course, the most influence comes from pre amp tubes, but the choice over there is more than enough to satisfy any needs. So, if someone says that all this are CRAP, their ego is just hanging on their ears. Just go and audition one.