LG CX BOSE Soundtouch PS5 5.1 problem

mino85

Novice Member
I'm really struggeling setting up my CX65 with the PS5 and all other sources.

I tried to set this up as a 5.1 sound system with the BOSE Soundtouch 300 + Rear Boxes (should be a 5.1).
But everytime I tried a youtube 5.1 test video, the rears are just left and right.

Same for the PS5. I never had this problems with the B7D and the PS4. But the new set up is driving me crazy.

Can someone please help me and tell me what settings I have to use on the PS5 and the TV to have real 5.1?

PS5 is connected to HDMI 1
Soundbar is connected to HDMI 2 (eARC)

Thanks in advance
 

next010

Distinguished Member
Webos
HDMI audio input = bitstream
Digital audio output = Auto
eARC = disabled

On PS5
HDMI device type - amplifier (not soundbar)
Number of channels = 5.1
Audio priority = Dolby

Most audio on Youtube is stereo and some YT apps use 5.1 upmixers which fake it.
 

mino85

Novice Member
THANKS!

Is is a problem to enable eARC? There is still sound coming from the soundtouch 300 after enabling this.

With the PS4, I had a delay in the sound when enabling Dolby. Is this normal?
 

next010

Distinguished Member
THANKS!

Is is a problem to enable eARC? There is still sound coming from the soundtouch 300 after enabling this.

With the PS4, I had a delay in the sound when enabling Dolby. Is this normal?
Your system does not support eARC which supports more audio formats, having it on could cause problems.

Your Bose 300 only supports ARC which on the CX is Dolby 5.1 and PCM 2.0 (stereo). PCM is the lowest latency audio format so should be lag free.

Audio lag is a known problem with Dolby on LG products, it depends on the hardware chain, if you are getting lag your options are limited.

1 - Check your soundbar for lag/delay controls or check any smartphone app tied to the bar, thats were you can find it sometimes these days.

2 - Your sound system has a 4K 60hz HDR pass-through HDMI input, you could plug the PS5 into that which should resolve the audio lag though this means your limited to HDMI 2.0 display features (if all you ever use is 4K 60 then this isn't a problem).

3 - try the optical output from the TV to the soundbar in the hopes its any better (it might not be).

4 - purchase the Sharc, an eARC bridge for older sound systems this will allow automatic audio lag correction on Dolby (though whether it works well is another matter) and PCM 5.1 or 7.1 if supported by your sound system (no idea of the Bose 300 does).
 

mino85

Novice Member
Ok, I tested again.
With PCM it seems like it‘s only stereo signal. Switching to Dolby and DTS causes a noticable delay.

Now I‘m thinking of two options:
1. connecting the ps5 directly to the soundtouch
2. buy an astro adapter to split the audio signal directly to the soundbar via toslink

What do you think should I prefer?
I‘m still not 100% sure where the delay is caused. Is it the TV that has this problema or is it the Ps5 itself? The cables?
 

next010

Distinguished Member
Ok, I tested again.
With PCM it seems like it‘s only stereo signal. Switching to Dolby and DTS causes a noticable delay.

Now I‘m thinking of two options:
1. connecting the ps5 directly to the soundtouch
2. buy an astro adapter to split the audio signal directly to the soundbar via toslink

What do you think should I prefer?
I‘m still not 100% sure where the delay is caused. Is it the TV that has this problema or is it the Ps5 itself? The cables?
The delay is in sound system and TV, differences in hardware, handshaking etc.

If all you ever use is 4K 60hz output (no 120Hz) then connect the PS5 directly to the sound systems HDMI input, that should solve the problem.

Not familiar with Astro adapter but it appears to be a generic HDMI audio extractor, the device is HDMI 2.0 based so would have no benefit over connecting direct to your HDMI 2.0 sound system.
 

mino85

Novice Member
I know that the CX is capable of 120 HZ 4K, but I don't think that there will be a game on PS5 that will support this. Is there anything else that is not included when going to HDMI 2.0?

Btw, as you are really a specialist as it seems, can you recommend some HDMI cables that I should use for the connection PS5 => BOSE => TV?

I tried the connection to the Bose last night already because it kept me sleepless ;) And sound is GREAT! Now I only struggle if DTS or DOLBY is the way to go. And I have to set up all the settings for the TV again, but this is the smallest problem =)

I'm more than happy right now with the sound. Hopefully there will be no negative point added to the visual part.

THANK YOU!
 

next010

Distinguished Member
I know that the CX is capable of 120 HZ 4K, but I don't think that there will be a game on PS5 that will support this. Is there anything else that is not included when going to HDMI 2.0?
There are a few but if its not something you really care about then 4k 60hz is fine.

That said OLEDs don't handle low 30fps all that well, it is better to have games running at 60fps or higher so I would stick with the 60fps performance mode as much as possible in games.

The PS5 barely uses any HDMI 2.1 features, the 120hz mode is really all it leverages at this time.

Btw, as you are really a specialist as it seems, can you recommend some HDMI cables that I should use for the connection PS5 => BOSE => TV?

If your getting 4K 60hz HDR output from PS5->Bose->TV then what you have is fine, any "certified premium high speed" HDMI cable is 4K 60hz HDR capable, no need to waste money.

I tried the connection to the Bose last night already because it kept me sleepless ;) And sound is GREAT! Now I only struggle if DTS or DOLBY is the way to go. And I have to set up all the settings for the TV again, but this is the smallest problem =)

I'm more than happy right now with the sound. Hopefully there will be no negative point added to the visual part.

THANK YOU!

Technically the highest quality audio should be LPCM 5.1 or 7.1 if the sound system supports it, Dolby/DTS are lower quality compressed audio streams.

Also turn on HGIG under HDR dynamic tone mapping in TV HDR game mode picture settings and re-run PS5 HDR calibration, you shouldn't have to do much more than that.
 

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