I currently have a system that consists of thiel, classe', and MIT. I've done extensive auditioning to get a very refined and dynamic sound (thanks to my buddies at echo audio for letting me take home about anything). first off I'm a diehard fan of MIT wires and interconnects. and many shows have featured this combination that I have (though I came up with this combination by careful auditioning not by copying others.) But wires aren't your question so I'll get to the point. before you do anything................. .................DUMP THE POWERED PREAMP.......Go passive. smaller, less electronics so there much cheaper, no power to corrupt it. think about it. we use expensive line conditioners for bad current but it will never sound as good as not useing power at all! also with todays high bit rate and clarity a passive preamp should power any system just fine. I have never had to turn it all the way up. It would be way to loud to listen to. My jaw dropped when I put a reference line peeminence one in my system. I got it 6 months ago. It only cost $1500 new! and I got it for $400 used! and it came out in 1991! yes 1991! much older than the rest of my gear. but really why would that matter? the signal doesn't go through a power supply or complex circuits. only through a couple basic circuits and a volume control. keeping the signal very pure. Instantly I noticed an amazing amount of clarity. no guessing game. the bass was way stronger and tighter, the sound stage got deep. really deep, instruments were more localized, and there was a blackness and quietness to the background that was almost ominous. these weren't minor differences but huge ones. I can't push these enough. put a passive preamp head to head with something powered, newer, and more expensive. You won't be disapointed. these preamps really show the character of each amp because they don't add or color over the signal. then try the levinson amp if you want. you'll be able to compare the two easier. The passive preamp is an untapped goldmine. I suspect that part of the reason they are not pushed as hard as they should be is because electronics companies and retail stores would stand to loss millions.(I'll probably have mine for the next 20 years) not much technology that would need to be upgraded in these. pretty basic. and how can a company or store sell a $3000 powered preamp when the $1500 passive sounds so much better? also people generaly don't like to mix and match components, but you would have to with these since not many companies make passive preamps. Sorry if I sound so hardheaded and maybe overly fanatical about pushing these things but I just love them. Thanks......Todd K. m