Currently Being ModeratedJun 30, 2012 7:18 PM (in response to zb223)
Nobody has any suggestions at all or is experiencing this problem?
Currently Being ModeratedJul 28, 2012 7:54 AM (in response to zb223)
Check the HDMI settings on the Onkyo. I recently discovered that RIHD had to be enabled in order for my Mac mini to recognize it as a multi-channel audio device. If RIHD is disabled on the Onkyo, the mini sees it as a stereo device, thus no surround sound.
Currently Being ModeratedJul 28, 2012 8:19 AM (in response to capaho)
Didn't work :/
The only workaround I could do is use as coaxial for audio and the hdmi for video...which *****
Currently Being ModeratedAug 17, 2012 6:57 PM (in response to zb223)
Does anybody else have any other ideas?
Please...I'm desperate here....
Currently Being ModeratedJan 16, 2013 9:16 PM (in response to zb223)
I have the same problem with my Late 2011 MacBook Pro. I have a Thunderbolt-to-HDMI connector and I connect HDMI to an Altona HDMI Audio De-Embedder (AT-HD570). Then I connect the Altona to my Denon amp via digital optical cable.
The Audio MIDI setup app allows me to select "5.1 Surround" mode for the device, but after I do, if I click the various speaker test buttons, only the front left and right speakers respond. The Denon amp front panel indicates that it is only receiving Stereo signals from the optical cable.
I use this same setup successfully with an HP Laptop in 5.1 Surround mode, and using Dolby DTS. It's very frustrating to not be able to hear full 5.1 surround sound from my Mac!
I believe I have the Denon amp set up correctly; it has an input mode which automagically sets the digital decoding based on the incoming signal. So I suspect that the Mac is only outputting Stereo.
Perhaps there is some way to *force* it to output 5.1?
Currently Being ModeratedJan 16, 2013 10:49 PM (in response to themikado2005)
Wow, just a few minutes after posting that, I somehow managed to get 5.1 Surround Sound working. I rebooted to MacBook Pro (it seems sadly necessary to re-boot Mountain Lion after switching to a different audio output), played an MKV video file which contains a 5.1 audio stream, and in Audio MIDI Setup selected a Format of 48000 Hz (which matched the audio stream in the MKV file). Suddenly my Denon amp showed it was receiving 5.1 channel audio, and it played it too.
A little experimentation showed that I can set the audio Format to anything 96000 Hz or lower and still retain 5.1 Surround Sound. One caveat though: the buttons which send test sound to the speakers still don't work for any but the front left and right channels.
Fingers crossed that this will still work after the next reboot. ;-)