To my knowledge the 525 didn't have that issue. It's only on the 7200, 630 and the 430. These models use the "Cirrus" logic as opposed to "Crystal" logic for their DSPs. It's based on the extension processors. Apparently (for example) you have a movie in DTS-ES. Well the first processor picks up DTS 6.1, then the second processor picks up your 7th channel and adds another processing to it (Neo:6). Here is where the delay is.

"We're on the island of Misfit Toys"