have you tried to set he tv to stereo and see if it works.
I have y 360 pluged in directly into my sound system with no problems.
do you have your 360 connected to and adpetr ike below
http://www.xbox.com/NR/rdonlyres/1AA3050E-3B26-46E6-BAE8-1CB60BBE6CF2/0/boxHDMI.jpg//[img] the on the right.
did you select the source on the sound system as well,
like,tv,radio, etc
I have y 360 pluged in directly into my sound system with no problems.
do you have your 360 connected to and adpetr ike below
http://www.xbox.com/NR/rdonlyres/1AA3050E-3B26-46E6-BAE8-1CB60BBE6CF2/0/boxHDMI.jpg//[img] the on the right.
did you select the source on the sound system as well,
like,tv,radio, etc