I have a 47inch LED LG tv and the only audio out port is the Digital optical, which is plugged up to a sound bar I have hooked up. I have a Bose Acustimass 3 Series Speaker system that I am looking to use as well for surround sound for my tv. If my digital optical port is already being used and there is no other Audio out ports to plug up the amp/or receiver, then how can I use the bose with the system? Your help will be much appreciated.