Just fyi ...my 10 yr old panasonic plasma, states all equipment connected via HDMI, will output only 2 channel audio fromthe optical out. However it will pass 5-1 from an antenna connected to antenna in. Just purchased Yamaha soundbar and went directly from twc box to soundbar via toslink. Sounds great. In an apt. Now and got rid of my avr, spkrs etc.HAPPY.