Ok, that's not good at all. Most likely scenario is an intermittent bias supply as that most often presents like that. "Normal" channel imbalance is cause by a parasitic charge sitting on the diaphragm and not being dissipated due to the extreme resistance of the coating. That won't cause distortion as it just diminishes the potential of the drivers so distortion would only creep in if you push the amp hard to make up for the difference.
Nope. Channel imbalance has been an issue with them (and every other Stax for that matter) but there is another reason for that.
The distortion comes in when i turn the left speaker vol to high levels ( not extreme levels though). Actually there was one instance the headphone went back to normal operation but it only lasted for few seconds. Damn.. japanese quality control is supposed to be one of best around.
Edited by hentai - 5/28/11 at 6:15pm