hello. i've just purchased a yamaha dsp ax620 amp which has (i think) 2 optical digital imputs. one i am going to connect my dvd to and i was wondering if i can connect my echostar to the other one this way, so i can get dts and dol 5.1 from any of the foreign channels. the receivers spec says it has this s/pdif(sony philipps digital interface) whatever that is,for digital audio. is this what i think it is and what connecter do i need? can anybody help?