I posted on your other thread as well. I used the Aleph 2s with the GFP 750 and a Meridian player and got more drive than I get with the Wadia 860x without the preamp. The GFP 750 in passive mode should work great unless your speakers are not very efficient. I have Dunlavy 4s (91db efficiency) I also have a Rotel 855 and I can tell you firsthand that if you upgrade to a Wadia you will get sound that is in another league compared to the Rotel and a preamp. If you don't care about switching sources then forget the preamp.
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