TVs & Home Theaters forum


4K TV to stereo audio not compatible with some Apple TV apps

by PrestonOrlando / July 12, 2016 12:19 PM PDT

Even the Geek Squad was thrown on this one.

I have a RCA input/output soundbar(acoustabar) from 2010. It worked perfectly fine with my 1080p tv, but today I updated to a 4K (VizioD65u).
The red and white RCA cables connected from the TV to soundbar result in no sound, however when I run a HDMI cable to the cable box/appletv and run the RCA audio cables from them into the stereo, it works!


The audio on Netflix and HBOgo do not work through the soundbar. It results in loud static anytime I try to play an episode, but works fine when just navigating through the menu screen of both apps.
Apps like Hulu, Trailers, ESPN, and ShowtimeAnytime work just fine.

Any advice?

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All Answers

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This sounds like
by R. Proffitt Forum moderator / July 12, 2016 12:26 PM PDT

First I used this manual.

So we're in luck it has RCA jacks that are outputs. But most if not all of these do not downconvert to stereo from HDMI when the audio source is other than Stereo.

See if you can find settings in those apps to send only stereo.

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by PrestonOrlando / July 12, 2016 12:39 PM PDT
In reply to: This sounds like

That's a great tip, but I don't see any audio options in the Netflix and HBOgo settings pages. The only options as to change on the apple tv are from auto ouput to 16bit, or from HDMI output to YCbCr, RGB High, RGB Low.
Thank you and let me know if you have any more suggestions!

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So this is on the Apple TV?
by R. Proffitt Forum moderator / July 12, 2016 12:50 PM PDT
In reply to: Response
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Not My Apple TV unfortunately
by PrestonOrlando / July 12, 2016 12:54 PM PDT

I have the 3rd generation Apple TV, and unfortunately my menu screen is different than the one attached to the link.
The only choice for Audio Output on mine is Auto or 16bit.
The Dolby Digital Setting is just auto, on, or off
The HDMI Output is auto, YCbCr, RGB High, or RGB Low.

Thank you, and if you think of anything else please let me know. Such a conundrum for me as it worked perfectly fine this morning with the exact same model of TV. The only difference being that the other one was 1080P, and this one is 4K

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I can't tell if you tried?
by R. Proffitt Forum moderator / July 12, 2016 1:36 PM PDT

Remember that almost all TVs won't downsample so the choice on Dolby is off. As to Audio, you have 2 settings to try.

Remember some TVs did downsample. For reasons I don't think are worth getting into, this one does not.

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Translate to a dumb dumb for me please!
by PrestonOrlando / July 12, 2016 1:41 PM PDT

I'm pretty new at this? When you say downsample do you mean tv won't condition itself to previous sources like RCA stereos, for example?
I will try the Dolby to Off and experiment with the audio 16 bit, and the three different choices on hdmi output.
Thank you!

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I think we did that.
by R. Proffitt Forum moderator / July 12, 2016 1:58 PM PDT

I don't think a treatise about Dolby or down-sampling is needed here. My bet is the old TV did it and the new one does not. Also the why this is, won't give us progress to getting what you have to work.

Certainly, Dolby would be set to off. And you can try the other settings.

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