Hello. I just got my home theater system set up. I am running an Onkyo TX-SR500 receiver with the Onkyo SKS-HT500 speakers using the xbox as a DVD player. How do I enable DTS? I can only seem to get Dolby Digital, even on DVDs that are compatible with DTS. Anyways since I heard DTS IS BETTER than Dolby Digital, I want to watch Jurassic Park in DTS. I enabled DTS on the xbox settings, how do I select it on the receiver Thanks for any help!