Sound delay on my LG theatre system?

Ive recently bought a LG theatre system, HT905TA, and hooked up with my sharp aquos tv using HDMI and red/white to my receiver. when I test my system it seems to be a bit delayed, about a few ms, not very noticeable but its obvious when the person speaks fast (or some specific words). this also happens with my my ps3 (using optical fibre).

note:
I notice theres an option on my system called HD AV sync or somthing like that, but it only tweaks the delay on the audio, which seems useless in my case :( (theres no negative in that option)

anyone has any solutions?

thank you
 
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