My Mac mini is connected to my Vizio M-Series TV using an HDMI cable, and the TV is connected to a Vizio 5.1 sound bar with an optical cable. Since the TV (which has stereo speakers) is first in the chain, the Mac downgrades a 5.1 signal to 2.0 despite the fact that the TV is passing the signal on to a surround sound-capable system. I have been on the phone for a long time with both Apple and Vizio, and there isn't a solution to the problem that either of them can offer. The TV can't report that it is capable of handling a 5.1 signal, and there's no way to force the computer to send one. Are there any method for getting 5.1 audio to play?