I've had the A2 for a few weeks now and it's always while I'm actually listening that I feel compelled to post something in this forum. But, I find I'm too sucked into the music to actually do it.
I LOVE this amp...
Yeah, it's got the mechanical hum and I'll be trading it in for another one sometime soon (can't hear it while the music's playin'!). But in the mean time, I am really enjoying the hell out of it. My Grado's have NEVER sounded so good.
Base extension has never been deeper or tighter. Sound stage has never been so large. And just overall, the music that I listen to has never sounded so good!
For those that care I'm listening on a home stereo system and not a computer based system. Preamp to A2 to Grado RS1's.