I just got my Beta22 earlier tonight and after fixing some major shipping damage (transformer came loose and took the PSU board with it) I had to try it with the Fostex T-50v1. These very rare phones simply love power (they are rated for a maximum of 2w ) and the Beta22 doesn't disappoint turning them into a mini SR-007 with plenty of tight, controlled bass which is slightly "tubby" on some tracks and an extended and slightly shrill treble. I'm sure some of this is due to the amp but I'll know for sure once I clean up the signal path a bit and perform some other upgrades. The most surprising thing is the soundstage as it has depth (for a supra aural at least) and it's on par with the SR-X Mk3 Pro. Some more impressions tomorrow as I have to be at work in less then 6 hours and I need the sleep...