Why do you think that the audio will go through a "filter?"

What you really want is the audio to be "locked" to the video, frame to frame, so there is no noticable delay between the audio and video.

The Rat. M80s, VP-150, QS8s, SVS PC 20-39+, OPPO, Onkyo 703s, Harmony 880 Sony 60" SXRD HDTV