This issue relates to Mac Book Pro's and hdmi audio functionality.
I am trying to resolve an issue for a community hall. The hall has a light projector (BenQ) with small internal speaks, and a Home Theater box with surround sound system (Sony BDV-E290).
All hdmi ports and cables are hdmi 1.4.
Normally, a single HDMI cable connects the light projector to the hdmi (incl ARC - Audio Return Channel) port on the back of the Home Theater unit.
The Home Theater unit has the surround sound speakers connected to it.
One can play a video file put on a usb thumb drive and plugging it into the Home Theater unit. Both video on light projector and sound via surround sound speakers plays.
Connect MacBookPro mid 2012 Retina laptop, so as to play video using internet on this system using the hdmi port. Connect MBP via hdmi cable to a powered hdmi splitter. This is to enable one hdmi cable out of the splitter to go to the light projector, while a second hdmi cable plugged into the hdmi port of the home theater unit so it can play the hdmi delivered digital sound data.
With this set up there is no sound from the home theater unit speakers, only video on the light projector.
Despite checking all home theater, and MBP settings, reading manuals, and lots of net research re Mac hdmi, hdmi sound, hdmi standards, etc. I am very puzzled.
The below diagram illustrates this set up.
The question is, should I expect this to work?
Alternatively, am I missing some technical understanding of the hdmi and sound capability of the macbook pro, hdmi port, or hdmi splitter, or concept of hdmi delivered ARC return?
After several hours of research I do not understand what the problem is conceptually, or in practice.
I have confirmed that the audio data output via the MBP hdmi port is active, and all hdmi cables are working. I have confirmed the surround sound speakers are working. I have read (several times) the home theater instruction manuals and tried all settings to my understanding, and played with any other setting I could think of value.
One experienced mac person's solution is that I need to use an hdmi switcher, rather than an hdmi splitter, and use an hdmi audio extractor to stream off the audio data from the laptops hdmi cable. Then rather than the audio data being supplied to the home theater box via its hdmi port, input the audio data via a fibre Tosink audio cable into the audio fibre port available on the theatre box for 5.1 surround sound.
This I think should work. However, I am puzzled and questioning that I should need to do this. Surely such a simple first solution should work. Yet, it does not.
Some relevant links: HDMI ARC functionality Confirms my understanding and use of ARC via hdmi. Apple MBP hdmi port audio functionality Confirms MBP hdmi port includes hdmi 1.4 and 5.1 surround sound consistent with home theatre box.