Best Power Amp for Adcom GFP 750 Pre?

I used the GFP 750 with a Pass Aleph 3 and it was a great match. Or if you need more power Aleph 2 monos. The GFP 750 IMO sounds a lot more transparent in passive mode. If your speakers are 89db @8ohms efficient you should be able to get plenty of volume with the 30watts per channel Aleph 3.

Passive mode works fine with the Aleph 3, I actually owned the combo. with the volume knob at 2 o clock you can drive 91db speakers to 100db or so. Active mode isn't too bad, but I experienced what Johns said as well, you lose a little detail.