I have a problem with my Matrix M-Stage. It usually works good for a while, but then there comes this low trembling noise creeping and eventually overtakes everything. When I press with downward force on my 6.5mm jack I can sometimes make it stop. This makes me believe there is something wrong...

It's come down to these two... I was gonna go with the grado, but then I saw ESW9's for $240 from beach camera (the grado's $215)... Anyway, I mainly listen to country and rock. It's gonna be powered by a D4 amp. Which one is to prefer?

I just can't seem to find this plug. Where can I buy one? (Preferably in Sweden) Am going to use one with a SR225i so I need a good one, if there's any difference.

Sorry for being one of those pain-in-the butt people. But I've been lurking head-fi for a couple of days (for example browsed through 200 pages in "post your portable rig"-thread). I bought a new ipod nano, gonna buy a D10 or Predator and I was gonna buy K601's along with that. I really liked...

I've tried searching here but woah the amount of results of people already knowing what the heck a USB DAC actually does. If I've got it right, it converts the digital sound in the computer to analog sound and sends it to the headphones. Does it bypass the soundcard? How does it get the...