So my Sony DAVC700 Home Theater in a box, DVD player somehow got all messed up. It still works, but the picture is all messed up. I decided to purchase a new DVD player, and use the Sony as a receiver. So I get a JVC progressive scan player. I then go to Circuit City to get an optical cable. There was a Monster Cable for 19.99 and another Monster cable for 89.99. I pick the less expensive one. When I switch on Dolby Digital or anything else its fine. When I switch to DTS, it keeps cutting out and kind of “pops”. Any idea what this could be? Do I need to purchase the more expensive cable? Thanks!