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Old 06-19-2014, 03:05 PM   #1
vscary
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Tivo Roamio getting sound thru speakers rather than TV

Just purchased a Roamio base model. Have it hooked up to our HDTV via HDMI. Have an old-style receiver (analog?). Trying to figure out how to run this through our receiver so that we get sound thru our stereo speakers instead of thru the TV.
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Old 06-19-2014, 04:29 PM   #2
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On the back of the Roamio Basic there is a yellow RCA hole and it is for composite output. It is only good for standard definition picture and analog audio. You can buy a composite breakout cable and hookup the analog audio to you receiver.

You need a composite breakout cable like the one TiVo sells here.
https://www.tivo.com/shop/detail/av-cable
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Old 06-19-2014, 08:16 PM   #3
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B) There's also an optical audio output jack on the back of the Roamio.

Some stereos have an input for this or you can get a DAC (digital analog convertor).

C) You might also check if your TV has an audio output, which has the advantage of supporting the other devices hooked up to your TV.
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Old 06-20-2014, 01:41 AM   #4
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Quote:
Originally Posted by worachj View Post
On the back of the Roamio Basic there is a yellow RCA hole and it is for composite output. It is only good for standard definition picture and analog audio. You can buy a composite breakout cable and hookup the analog audio to you receiver.

You need a composite breakout cable like the one TiVo sells here.
https://www.tivo.com/shop/detail/av-cable
That's not an RCA (or phono--short for phonograph) jack, that's a 1/8th inch phone (short for telephone) jack (sometimes called a mini-phone jack), the baby brother to the 1/4 inch phone jacks which were used in the switchboards you see in old movies with operators plugging in cables to connect calls, and which are the things on electric guitars and amplifiers into which one plugs connecting cables.



That particular jack is of the tip-ring-ring-sleeve variety if I'm not mistaken, which allows it to correspond to the yellow (composite video) and white and red (left and right audio) RCA jacks found on stuff like VCRs, with a common ground for all three signals.


So a cable with a 1/8th TRRS plug on one end and three RCA plugs on the other would be needed to extract audio if it can't be or isn't either sent or received via the HDMI connector.


When video was added to the tip-ring-sleeve stereo miniplugs (such as found on more recent headphone cords), there was no longer universal agreement on which connector would carry which signal or which would be the common ground, so one needs to do one's homework when obtaining one.
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Old 06-20-2014, 09:42 AM   #5
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FYI, the TiVo breakout cables are wired:

Component cable - sleeve is ground, ring 1 (nearest the cable) is red, ring 2 is blue, tip is green.

Composite cable - sleeve is ground, ring 1 is right audio, ring 2 is left audio and tip is video
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Old 06-20-2014, 02:50 PM   #6
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Quote:
Originally Posted by Diana Collins View Post
FYI, the TiVo breakout cables are wired:
...
Composite cable - sleeve is ground, ring 1 is right audio, ring 2 is left audio and tip is video
This would mean a typical 1/8" to 2x RCA cable (L/R or white/red) could be used for just Audio Out.

Someone want to test this?
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Old 06-21-2014, 09:22 PM   #7
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You guys rock. The solution was using a Toslink Digital Audio Cable to connect the TiVo to the receiver. Now we have awesome sound, and the TiVo doesn't get returned to Best Buy!!! Really appreciate your help...
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Old 06-22-2014, 03:30 AM   #8
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Originally Posted by telemark View Post
This would mean a typical 1/8" to 2x RCA cable (L/R or white/red) could be used for just Audio Out.

Someone want to test this?
Don't need to test it to know that it won't work.

The plug on the non-RCA plug end of the type of cable about which you're talking has a tip, which is supposed to be the left channel, one ring, which is supposed to be the right channel, and all the rest, back up to the shell (which is the part by which you're supposed to hold it when plugging and unplugging) is the sleeve, which is common ground.

Using this type of cable plugged into the Roamio's composite jack would send composite video to the left channel input of your A/V receiver*, left audio to the right channel input, and would short the right channel output to ground**.


*which would, at best, produce some rather unpleasant sounds.


**if you're fortunate, this wouldn't draw enough current to do any damage.
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Old 06-22-2014, 04:21 AM   #9
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Originally Posted by unitron View Post
Don't need to test it to know that it won't work.
...
Using this type of cable plugged into the Roamio's composite jack would send composite video to the left channel input of your A/V receiver*, left audio to the right channel input, and would short the right channel output to ground**.
You're right. I wrongly assumed it was an extended length 4 ring, which I guess isn't that common of a connector.

To make my original idea work, someone would have to not insert a 3 ring all the way. I tested this works electrically, but it's not that stable because it can't be bumped too far.

Last edited by telemark : 06-22-2014 at 04:29 AM.
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