High Def Forum
Thank you for visiting. This is our website archive. Please visit our main website by clicking the logo above.

HDMI input to Digital Audio Output

11-07-2009, 09:32 PM
Hi - I'm new to this forum, so please pardon any breach of the forum protocols. I was browsing the archives of this forum and back in 2004 there was a question raised about obtaining 5.1 sound from the Digital Audio Output of a Mits TV when the source was provided via an HDMI input. The general issue seemed to be that the TV would not provide 5.1 sound from the Digital Audio Output when the source was an HDMI input. I recently found myself in exactly this situation. I have a Mits WD-72833 which has 3 HDMI inputs on the back panel. I have the Digital Audio Output of the TV connected via coax to a coax digital input on my A/V receiver. If the TV source is Ant 1 or Ant 2 from a cable connection and the TV is tuned to a digital channel, the receiver displays that it is receiving Dolby DIgital 5.1 sound and the speakers are driven appropriately. However, if the source is one of the 3 HDMI inputs, the receiver displays that the sound is stereo and only the front 2 speakers provide sound. This indicates that the posts back in 2004 were correct and that the TV will not provide 5.1 sound when driven from a HDMI input. It also indicates that the TV is capable of providing 5.1 sound from non-HDMI sources. So far I have gotten around this issue by separate connections from each HDMI device to the receiver, but I was wondering if there is a way to have the TV provide 5.1 sound over the Digital Audio Output from the HDMI devices rather than the individual connections. BTW I have talked to Mitsubishi customer support. They promised to look into it and get back to me with an answer, but so far I have not heard anything.



11-07-2009, 10:14 PM
I think most TV don't.

11-08-2009, 03:18 AM
No, there is no way around this. The digital output will ONLY send 5.1 sound from the internal ATSC tuner. Everything else is stereo ( 2.0 ) sound. I have no idea why the manufacturers have not included 5.1 sound from all other inputs, but I'm sure they have their reasons ( $$$$ ). :2cents

Chris Gerhard
11-08-2009, 04:06 AM
Some displays will take a multichannel HDMI or optical audio input and output multichannel over the optical audio output. I don't know if there is a list of displays that will and I don't know how common it is. It is a nice feature if it is needed but meaningless when it isn't of course. I seem to recall being surprised that my Vizio SV420XT1A did that but I don't need it and don't use it except by accident at tmes. When I think about it, I will check it again and make sure it does passthrough for Dolby Digital and DTS.