You dont have to be an audiophile to appreciate the enhanced surround sound effects from Dolby TrueHD or DTS-HD Master Audio found on most Blu-ray Disc movie discs over the standard Dolby Digital or DTS formats found on standard DVD movie discs. The lossless audio compression formats and/or the two extra channels of sound output really adds a significant amount of realism to the whole movie watching experience. The problem is most HTPC owners dont have the ability to experience these enhanced formats due to a lack of sound cards on the market that can support these formats.