I set up the 950/770 combo with NHT VT2 fronts, SV Sub and Mirage center-surround-rear surrounds about one month ago. I used a RS SPL to calibrate with my main volume set to -10dB and speakers at targeted at 75 dB. Life was good. Really good.

Three weeks pass and I suddenly notice there's not much sound coming form the rear surrounds. There is some sound but it is very low. The funny thing is what sound there is not distorted, just very low power. I'm sure I've changed something configuration setting but have tried for the last week to figure and can't...I'm stumped. I've tried 7 channel stereo and calibrating again but can't get the volume up significantly.

Any ideas?

Thanks much, Carey