I've heard great things about the MG Head/Senn 600 combination, but how would it sound with Grado 225's? It has a high/low impedence switch, so I thought there might be some chance for compatibility. Thanks, Josh

I have to admit it is a cute looking amp, but would airhead -> Porta Corda be much of an upgrade? Has anyone heard it yet? Any comparisons to the airhead? How about the original Corda?

current system: grado 225 + airhead + panasonic portable. what would be a good amplifier upgrade that would work well with the grados? portable & non-portable suggestions welcome. thanks, josh