After all of one day with my new amp, murphy's law struck! I turned on the amp, let it heat up and went to look for something to listen to, only I couldn't get sound out of the left channel. To equalize the volume I had to turn left up to about 2:00 when I had right at 10:00. My first thought was that the amp had been damaged in shipping or built wrong, but I tried the headphones on my old amp and only got sound out of the right. Then I wondered if the amp somehow blew the left channel and took the adapter off and tried it out of my PMP. The sound was thin (obviously), but both channels work just fine.
There's obviously a problem with the adapter or the cord. I tried a new adapter and had the same problem, but I only have the one screw on adapter so I don't know that I had a connection on both channels.
The headphones are a year old, so they're under warranty. Should I send them to Beyer and let them diagnose the problem, or should I buy a new screw on adapter and see if that's all that I really need? Thanks.
Beyer DT990/600? I had the exact same issue. Left channel only has 30% of its sound. there's nothing wrong with your headphone, try it on another amp. And there's nothing wrong with your amp either.
I've owned the 339 for almost 2 years now I think and the DT990/600 is the only headphone that ever had that problem, so I sold it. Try pulling out the plug just a bit, you'll hear the headphone is fine.
They're just not all compatible it seems. With my other Beyers (T70, COP, DT770 PRO LE there is no problem at all)