HDMI splitter "hack" to preserve surround sound - AVS Forum | Home Theater Discussions And Reviews
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Old 01-06-2014, 08:19 AM - Thread Starter
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I want to split a HDMI signal to surround processor and directly to TV. I understand that if the TV is then on, the processor will only receive a stereo signal. Does anyone know of a fix for this? I'm thinking such as HDFury etc.
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Old 01-06-2014, 09:26 AM
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So you want to convert HDMI to component video to get a surround sound signal? That makes no sense but it is what HDFury does.

Let me answer your question - HDMI only allows one audio and one video signal (stream) to be sent out at any time. So sending out high resolution multichannel audio at the same time you send out stereo audio can't be done (that's two streams). With HDMI you can either send multichannel or you send stereo but not both at the same time. Also, the HDMI spec requires that all sinks (the destination devices) receive a signal that is compatible with the destination device.

So, if you have a TV and an A/V receiver hooked up, the only compatible audio signal for both of them is stereo. Also remember that the audio and video are sent out as a data stream not as separate signals. There is no "fix" for this since the HDMI signal is working as designed.

Now having said that you can "bypass" this limitation by looking for devices that fool or spoof the EDID (which is what contains the configuration information). There are a number of matrix switchers that will do this spoofing. The key thing here is that if you tell the system that everything is multichannel, then the TV will not be able to process the audio signal. So, you will still only have one device that generates audio with this type of matrix switcher.

Normally an AVR will do this for you. Does your AVR not have HDMI inputs?

Finally, whether a sink is on or off is likely irrelevant. Most devices when "off" are actually in standby and so the EDID is still sent. It is only if you pull the AC plug that the EDID would not be sent.
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Old 01-06-2014, 10:12 AM
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Sonos makes a sound bar (as part of a surround sound solution) that only takes an optical input - the intent being to connect the optical output from the TV to the sound bar. The problem, as folks have found, is that many TVs only output 2 channel sound from the optical output.

This type of device has been used by some to work around the limits of the TV optical output:


Perhaps something like this device could solve your problem.

Regards, Frederick C. Wilt
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Old 01-06-2014, 11:00 AM
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Yeah, let's take a step back and ask what are you trying to accomplish? Knowing that we'll be able to propose a better solution...

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Old 04-21-2014, 06:17 PM
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I will bump this thread since I am looking into a similar solution.

I want to split HDMI signal from HDI Dune player into a receiver (for multichannel music playback) and directly into a computer monitor (via HDMI-DVI cable) with native 1280x1024 resolution. Dune supports this resolution but I do not believe the receiver does. I need yet to try, but then I may need to switch receiver anyway so I'd like a solution that is receiver agnostic.

Any way to accomplish it with a HDMI matrix switch/splitter?
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