When I switch the PS3 on & it displays the background (forget the proper name) with all the various icons for games, video, music etc, there is no bass at all going to my sub. For example, I have the demo for Motorstorm and until the other day when I highlighted it, the music it played had really deep bass but now I'm getting none at all. I know it's no major problem but it's annoying as all of a sudden, there's no bass on the menu system. Blu-rays & the actual games are fine. Anyone else have this problem? If not, would you be tempted to exchange it for such a small thing?