Have just got mine. When I first connected it up, there was only sound from the left speaker. I tried a different cables and players and they were the same. Then later as I was swapping cables the sound came on. I managed to track down the connection problem with the socket on the headphone. I can still use the headphones but I do not know if the problem will become worse. Anyone has the same problem?
About 5 weeks ago, my Fidelio X1 developed a mild case of intermittent audio. The 3.5mm jack connector on the headphone was causing the problem. I had to fiddle with it to get a good connection and try not to move around or bump the cable connector. I still need to get it fixed, but until then I got one of those $149 X1 deals from Amazon 2 weeks ago.