I have just bought the DENON AVR-1905 and it has a fantastic sound - especially for multichannel home theatre. The only problem I have is that I have had to use 6 channel split into this receiver rather than the optical in as the Denon doesnt seem to provide a secure connection (it spits out the cable end almost). Does any one know anything about this? There are screws next to the port and I am wondering if these have to be loosened before inserting the ptical cable, and then reinserting once the screw is retightened.