Dolby Labs Laboratories XP Series PS3 24 Channel Noise Reduction – Retro Gear Shop
I just noticed several PS3 games have DTS while their 360 counterparts only have regular Dolby Digital. This explains why I thought these games sounded better on PS3; because they did! Here's
How Do I Get Surround Sound from my PS3 without HDMI: BigPictureBigSound