Unequivocally, yes.
I've had many of the same others have had: first PS Audio, then FIM 880 (gold and regular), now FIM on one outlet, Oyaide R1 on one and Synergistic Teslaplex on one. All different sounding: I THINK the Teslaplex may actually be the most neutral of them all, but I'm not sure. I'll plug both the integrated and the CD player into the Audience aR2-T (Teflon version, which will tell you everything you ever wanted to know about what your equipment ACTUALLY sounds like without making it sound "bass-ier", "more 3D" "better highs" and the like (although it can do that, but only per recording, not on ALL recordings [which would likely be a coloration, anyway, right?] and then report back. But yes, I had wondered why my highs were softened (pre-Audience, by the way) until I changed to the Oyaide and the lower treble range (trianges, tambourines) reappeared -- without brightness. I belive the FIM has a very slight suckout in that frequency as well as softening transients, although it's quite nice. The PS Audio Power Ports don't have that softening effect at all, but I haven't used them in years, so I'd have to re-install them.
Bottom line? Outlets matter.
