Thanks for the review OICDN. very nicely worded. I agree with everything you said about the SR71. aside from the veil, it sounds pretty good to me, I just hate recessed mids, and it makes them feel so far away.
I must say though, I don't agree about the ergonomics of the Xin Supermicro IV. I feel it is the only portable amp that is truly portable. I mean yes, you can fit others in a pocket with an ipod, but it is not comfortable, it bounces all over, and its kind of obnoxious.
I attatched velcro to the supermicro, put some velcro on the side of the ipod, on the top, next to the screen, and hook them up. that way, it isn't moving around in the pocket, and its like there isn't anymore than just an ipod there. Really great. A volume knob is a litttle easier, but i never had a problem with the wheel.
I just thought I would offer a counter opinion

thanks though!