I am using the Sound Hub HTS3261 and I am having problems with sound delay.

I experience sound delay when I am on AUX or iLink. I connect my TV (for cable TV viewing) with apple TV and other devices to the home theater through RCA cables and use the AUX source, however there is some delay in the audio. I tried the audio sync option but the adjustment just goes up which makes the delay worse.. there is no option to do a negative MS adjustment.

Any suggestions?