I ordered my 580s from amazon and just got them..... I plugged em in and only the left side was working. I checked the connection on the right side and didn't help. I checked with another pair of headphones and they worked fine. I was very surprised to get defective headphones based on...

I just ordered my first set of quality headphones. I spend many nights watching movies or listening to music after my wife has gone to bed and needed something comforable with good quality. I've read many posts and still wonder about a separate amp. I have a Yamaha RX-v800 (about 2-3 yrs old)...