hi,if anybody could help.i have just bought a new sony tv.it is connected to sky hd+ box and surround amp dennon 1803.it has sub woofer and other speaker set up.old system was working fine.just replaced old tv.all the cables are connected as before.sky box is connected through hdmi to tv.audio phone out from sky box to amp phono input .do i need to connect amp to box using coaxal or optical digital cable.which is better.tv without amp works fine.when i switch amp on sound only goes to rear right speaker.no effects setting on amp remote seems to work.whats a best connection set up through dolby sorround amp.