Maybe it's not ready for prime time
"Apparently there's some fairly major sound mastering issues with Ep. IV: ANH. According to TDB:
Editor's Note: since we initially wrote this review, we've detected a number of audio/mixing errors on the DVD version of A New Hope. They are as follows:
1) The familiar Force theme trumpet fanfare that used to play right after Red Leader says: "This is it!" and just as the X-wings start diving towards the Death Star's surface has been dialed back in volume so that it's almost inaudible - it's almost completely buried in the surround mix.
2) The audio quality varies wildly as Tarkin says the line: "You would prefer another target, a military target? Then name the system." - almost as if the master sound element was damaged. It's very distracting.
3) Possibly most critically, John Williams' entire score for the film has been flipped in the rear channels, so that what should be the left rear channel is playing from the right rear channel (and vise versa). What this means is that the rear channels don't match the front channels - instruments heard from the front right channel come from the left rear instead of the right rear. Again, this is very distracting once you notice it.
These problems are certainly severe enough in our opinion to merit a repressing/exchange of the disc. We're waiting to hear back from Lucasfilm on this issue and we'll update this review with the details as soon as we do."
Oh, and I thought this was funny (from http://www.penny-arcade.com