Well.....on Moby--"PlAY" TRACK 4 THERE IS A VERY LOW SUSTAINED BASS NOTE. When this note is playing with the Spec 1, the bass had a tendency to ......."wash over" the mids and highs. It's hard to explain but easy to hear. Withe the Acurus there was none of that. It was crisp and clean regardless of the program material, whether it was a very "crowded" passage or not. Now the Spec, as Echowars specced em is a VERY GOOD pre-amp, regardless of the phase shift shown, and perhaps we have heard what "phase coherent" means today. The Acurus is VERY SMOOTH...I guess is how to say it. The highs are very clear. The bass is a tossup between the two, and with these horns the smoother the top end is the better. I'm definately impressed with it. Jani says it's the best 325.00 we've spent on audio gear. She absolutely loves it....
And the most amazing part?? Having an amp that will let you hear differences this slight in preamps .....phenomenal!!