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post #1 of 21 Old 01-28-2020, 05:18 PM - Thread Starter
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Optical cable question

I currently don’t have a 4 K receiver. I want to upgrade but in the meantime use my current non 4K 7.1 receiver.

How do I run my current receiver and still get 4K?

My plan is to run an HDMI from my Directv box to my 900F and then run an optical cable from my TV to my current non 4K receiver.

But I was at BB today and the salesman said that an optical cable will only run a 5.1 audio system and not a 7.1 system.


Is that correct? Someone please clear this up for me.

Last edited by Pittfaninloco; 01-28-2020 at 05:22 PM.
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post #2 of 21 Old 01-29-2020, 10:59 AM
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There is a high likelihood that the TV won't even pass a 5.1 signal; only a 2-channel downmix.

Does the DirecTV box have an optical or coax audio output, too? If so, it will probably be active simultaneously with the HDMI output. And, if so, you could try connecting it directly to your AVR.

And, btw, does the DirecTV broadcast 7.1 audio, anyway?

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post #3 of 21 Old 01-29-2020, 11:07 AM
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Quote:
Originally Posted by Pittfaninloco View Post
I currently don’t have a 4 K receiver. I want to upgrade but in the meantime use my current non 4K 7.1 receiver.

How do I run my current receiver and still get 4K?

My plan is to run an HDMI from my Directv box to my 900F and then run an optical cable from my TV to my current non 4K receiver.

But I was at BB today and the salesman said that an optical cable will only run a 5.1 audio system and not a 7.1 system.


Is that correct? Someone please clear this up for me.
Correct that max signal a optical cable can pass is 5.1 considering your situation I would do what you are planning.
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post #4 of 21 Old 01-29-2020, 11:25 AM
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this is how I run my system. I only have 5.1 tho

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post #5 of 21 Old 01-29-2020, 12:33 PM - Thread Starter
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Quote:
Originally Posted by sivadselim View Post
There is a high likelihood that the TV won't even pass a 5.1 signal; only a 2-channel downmix.

Does the DirecTV box have an optical or coax audio output, too? If so, it will probably be active simultaneously with the HDMI output. And, if so, you could try connecting it directly to your AVR.

And, btw, does the DirecTV broadcast 7.1 audio, anyway?
The Directv box has a digital audio RCA output, no optical
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post #6 of 21 Old 01-29-2020, 12:41 PM
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Quote:
Originally Posted by Pittfaninloco View Post
The Directv box has a digital audio RCA output, no optical
It does have HDMI out though right? IF you run the HDMI to your tv and an optical form the TV to the AVR you will (should) get 5.1 sound, it would depend on the source material of course, tv shows vs movies.
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post #7 of 21 Old 01-29-2020, 12:49 PM
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Technically, an optical cable can run discrete (Lossy) 6.1
https://en.wikipedia.org/wiki/DTS_(sound_system)#DTS-ES

FOr anything higher than lossless 2ch, optical can only carry lossy compressed 5.1/6.1 (DD/DTS)

Need HDMI for lossless >2ch

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post #8 of 21 Old 01-29-2020, 01:44 PM - Thread Starter
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Originally Posted by liffie420 View Post
It does have HDMI out though right? IF you run the HDMI to your tv and an optical form the TV to the AVR you will (should) get 5.1 sound, it would depend on the source material of course, tv shows vs movies.
Yes on the HDMI. From my Directv box can I run the HDMI to my TV for 4K and run the RCA to my receiver for 7.1?
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post #9 of 21 Old 01-29-2020, 02:01 PM
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Quote:
Originally Posted by Pittfaninloco View Post
The Directv box has a digital audio RCA output, no optical

And does your AVR have a coax ("digital audio RCA") input? If so, I would use it. Use PLIIx to upmix the 5.1 to 7.1.

Again, does DirecTV even do 7.1 audio? Even if capable, most stuff probably isn't 7.1, anyway.

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post #10 of 21 Old 01-29-2020, 02:01 PM
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Quote:
Originally Posted by liffie420 View Post
It does have HDMI out though right? IF you run the HDMI to your tv and an optical form the TV to the AVR you will (should) get 5.1 sound, it would depend on the source material of course, tv shows vs movies.

Most TVs do not pass multichannel audio except from OTA sources.

Some might be able to but it is only 5.1.
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post #11 of 21 Old 01-29-2020, 02:12 PM
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If I may elaborate (with my additions in bold)



Quote:
Originally Posted by sivadselim View Post
Most TVs do not pass multichannel audio (of any type) except from OTA sources from the TV's internal tuner.


Some might be able to but it is only lossy DD/DTS 5.1. Check your user's manual.

S/PDIF (optical/coax) does not carry lossless formats.



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post #12 of 21 Old 01-29-2020, 02:16 PM
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Quote:
Originally Posted by Pittfaninloco View Post
Yes on the HDMI. From my Directv box can I run the HDMI to my TV for 4K and run the RCA to my receiver for 7.1?
No the RCA will only pass 2 channel signals. You want to run the optical out from your tv to your avr. Alternatively you could get a box that strips the audio channel out of the HDMI signal from your direct tv box and run that audio only HDMI to the receiver.
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post #13 of 21 Old 01-29-2020, 02:26 PM
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Originally Posted by liffie420 View Post
No the RCA will only pass 2 channel signals.
I believe you misunderstood. The poster means "digital coax" which has an RCA connector. It will pass DD/DTS 5.1



Quote:
You want to run the optical out from your tv to your avr.
Again... not all TV's will passthough DD/DTS via the optical from an HDMI connected source.



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post #14 of 21 Old 01-29-2020, 02:36 PM
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Originally Posted by Ratman View Post
I believe you misunderstood. The poster means "digital coax" which has an RCA connector. It will pass DD/DTS 5.1




Again... not all TV's will passthough DD/DTS via the optical from an HDMI connected source.
You sir are correct,right after I posted that I was like why the F would a modern cable box have old standard rca's.
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post #15 of 21 Old 01-29-2020, 02:51 PM
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Originally Posted by liffie420 View Post
You sir are correct,right after I posted that I was like why the F would a modern cable box have old standard rca's.
Too quick to answer without reading.


Quote:
Originally Posted by Pittfaninloco View Post
The Directv box has a digital audio RCA output, no optical
The poster clearly stated "digital audio".



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post #16 of 21 Old 01-29-2020, 03:59 PM
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Originally Posted by liffie420 View Post
.................right after I posted that I was like why the F would a modern cable box have old standard rca's.

Well, many (most?) do still have R/L analog RCA outputs.

But, as pointed out, the OP is referring to a digital coax output.

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post #17 of 21 Old 01-29-2020, 04:36 PM - Thread Starter
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Originally Posted by sivadselim View Post
Well, many (most?) do still have R/L analog RCA outputs.

But, as pointed out, the OP is referring to a digital coax output.

No, it’s not a coax output. Box has a coax in. The digital output is one RCA connection labeled digital audio.
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post #18 of 21 Old 01-29-2020, 04:40 PM
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Originally Posted by Pittfaninloco View Post
No, it’s not a coax output. Box has a coax in. The digital output is one RCA connection labeled digital audio.

And that is called a digital coax audio output. It outputs the same thing as an optical output.

And, yes, your box has a coax cable F input.
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post #19 of 21 Old 01-29-2020, 04:50 PM - Thread Starter
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And that is called a digital coax audio output. It outputs the same thing as an optical output.

And, yes, your box has a coax cable F input.
Ok, sorry for my ignorance. When I think coax I think of the cord coming from the wall plate into the Directv box.

So if that connection is like a optical output can I run a cable from that output on my Directv box to my receiver?

Would that deliver 7.1 audio?

Last edited by Pittfaninloco; 01-29-2020 at 08:27 PM.
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post #20 of 21 Old 01-29-2020, 04:54 PM
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this link may help https://www.the-home-cinema-guide.co...tal-audio.html

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post #21 of 21 Old 01-29-2020, 11:00 PM
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Quote:
Originally Posted by Pittfaninloco View Post
So if that connection is like a optical output can I run a cable from that output on my Directv box to my receiver?
Yes, which is what I recommended several posts back. Run a coax cable from your box to one of your AVR's coax inputs. Your box should still output audio via the coax output even though you are using an HDMI connection to the TV for the video.


Quote:
Originally Posted by Pittfaninloco View Post
Would that deliver 7.1 audio?
I don't think so. But, again, I am not sure your DirecTV box would transmit "7.1 audio" even via an HDMI connection. And even if it can, most material is probably still not 7.1; most is only 5.1. You use a setting in your AVR (something like PLIIx) to upconvert 5.1 audio to 7.1 audio.




BTW, you said you don't have a 4K AVR. But does it have HDMI inputs?

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