- Feb 14, 2004
I have been using my SM for more than 200 hours and it's fully burned in. Though it sounds fantastic with batteries alone, I would say it performs better with AC power than with batteries. With the AC adaptor plugged in, the SM deliver more consistent and better separated sound image while playing complex music. And SM seems to sound the best when plugged in the AC adaptor with rechargeable batteries in, but I am not quite sure as the sound difference with/without batteries in is subtle. Is it just because both AC power and batteries provide current for SM when playing complex music?