M^3 with Variable Bass Boost, Crossfeed and STEPS PSU
Will Ship To: Anywhere
This is the best amp I've ever owned. Running off of three active channels employing the OPA 627 for each, it has a variable bass boost, which allows you to bring up the bass (or bring it down) as each track dictates. The high/low Crossfeed circuits let you compensate for the lack of natural crossfeed in headphones. The high/low settings also let you regulate the degree of crossfeed compensation, from moderate to radical, depending on the needs of each track. When I originally purchased this amp, I bought it with a wall wart. I later spent an extra $100 to get RDS to make me a matching STEPS regulated PSU. The difference was like night and day. I had no idea how much better the sound would be with a regulated PSU, but the difference is too big to chalk up to any placebo effect.
I've run lots of different headphones off this unit, including the Grado SR60, SR80, SR225, SR325i, RS1, GS1000, PS1000, SR60i, SR80i, SR225i, SR325is, HF2, HD800, T1, AKG 701, AKG 240 Sextett, DT770/600, etc. I've yet to find a headphone that can't be powered by this unit. What's more, because of the variable bass boost, I've yet to find a headphone that couldn't crank out as much bass as any but the most diehard bassheads would want. If you think the HD800 can't be turned into a bass machine (on demand), this unit will change your mind.
It's an awesome box of fun, one that will upgrade any headphone. I no longer need it (I'm building a Beta 22). If you want it, I'll let it go cheap, but only in the U.S. Anywhere outside the U.S., you'll have to pay the extra freight.