OK.....I have a problem I cant seem to figure out. I have a NAD T763 reciever that I'm currently using as a pre-amp for 2-channel music. It's connected to a Rotel RB 1080 amp. two days ago, I bought a pair of headphones and plugged them into the NADs headphone jacks and.........nothing! No sound from the headphones, and plenty of sound from the speakers (LSi25's). What am I missing here? Does anyone who owns a NAD reciever have any ideas?