Originally Posted by ntxoa
On the Oppo’s audio processing, I set all the speakers to 50’ except for the sub which is at 0’.
My LFE signal also goes through an RF transmitter connected to the Oppo.
Between all that, it seems to be ok by ear. I don’t have any equipment to do actual measuring.
(after writing this I'm almost looking forward to running into a sync problem just to play around and verify the following)
well 50 feet is 44.5 milliseconds. Best answer: The latency is 37ms when measured with a scope. By RocketfishCustomerSupport 6 years ago. So just over 80ms total for you including a typical wireless subwoofer kit.
If I'm upmixing via Xbox I came up with something like a setting of 78.37 ms (yes you could hear .01 ms). I think my shield pro and Sony X700 in youtube make fairly low pitched boinking noises as you navigate. I have got into upmixing settings with Xbox where I couldn't get the sub to delay enough.
Your situation is acceptable as what you don't want is too little delay. When listening to a low pitched voice that will tend to really localize.
When I play on my Oppo it goes to minidsp which adds delay. A regular minidsp adds 1.07 ms latency. That is the equivalent of 1.12 feet behind a loudspeaker. The minidsp HD is around 3 ms, so worse but might be accepable with subwoofers in analog system. I have a friend with sub behind some highend speakers that is about the equivalent of this delay. (To refresh the minidsp hd has a delay setting of up to 80 ms while the balance and regular unit have less than 10 ms so of little help).
So when I play the Oppo it likes 19.00 ms delay and this is with all the speaker distance settings on 12 feet. (Does it matter whether speakers on large or small.
). So if minidsp is adding 3 ms delay this means the Samsung K950 adds about 16 ms delay, oops, my subs are ...about 3 feet behind my sound bar, so just under 3 ms delay there too, so maybe 13 ms delay for our sound bar to output and this may well be because it needs to time with the wireless units.
So in conclusion if you have analog only subwoofer system (which is not what this thread is about) then you can have your subwoofers nearly three feet closer to the listening position then your main speaker or even closer and zero out the delay (like I've said this is not very audible if at all, but you could get phase issues perhaps with some bass cancellation).
For the Samsung K950 soundbar and likely its successors you need to add some delay. In your case with the assumed Rocketfish wireless bass signal then for playing from Oppo direct or any source going through the hdmi input you probably can set your Oppo distance setting back to equal or zero feet and then you only have about 20 ms of extra delay.
If you're doing Atmos upmixing via Xbox then you get a lot of delay and of course the Xbox has to be after the Oppo since the Oppo hdmi input won't accept PCM Atmos from the Xbox (or ATV4K for that matter). (Note in my system with AVR Key splitter after fire cube I have a method that I've posted elsewhere that will upmix much of the stuff to DD+ Atmos you play from a fire cube and that can go into input of Oppo.) In that case your maximum delay is very necessary and might still be coming up short (I need to test more). I'd forgotten about the Oppo distance setting and another 40 ms delay will be really nice.
For lip sync in general I think the Oppo can only fix so much when dealing with Xbox. Basically if you advance their setting to -100ms it does not do that! It only allows the Oppo's video delay to fully impact the signal and they say they can't put audio any further ahead of that. How to maximize Oppo video delay.
...Well found this from Oppo on delay:
"The negative adjustment values are for cancelling out the audio delay that the player automatically
applies. Depending on the video source and the time it takes to process the video, the main
decoder chip automatically applies an audio delay in order to optimize audio video synchronization.
The negative manual settings reduce the automatic audio delay, while the positive manual settings
apply additional delay. Any negative value setting beyond the player's automatic delay will be
treated as completely cancelling the automatic delay. For example, if the "A/V Sync" value is
manually set to -100ms and for the current video source the player applies a 70ms automatic audio
delay, the final result is that the 70ms audio delay gets cancelled and the audio is not delayed at
all. It is not possible to put audio ahead of video using this setting."
Ugh. I hate this stuff and maddening to adjust with the Oppo's sync settings sometimes bypassed or partially bypassed.
The following are some search notes that really only apply to LG TVs. I try using the Oppo's setting and at least the above explains why the settings never seem to do that much when you want more because they aren't doing anything. LG's with Dolby Vision can have video delay which might counteract the Xbox atmos upmixing audio delay enough to come to some compromise, the Oppo's sync setting apparently does nothing with DV content (bypassed), but maybe the Xbox audio delay and LG video delay might match. ATV4K can upmix everything to DV so you might be able to force this video delay split off the audio and maybe delay it some more in the soundbar. This has nothing to do with subwoofer sync except that you might need more delay than the minidsp will do so in that case you can put the oppo speaker distance settings to 50 feet so the analog sub output is delayed up to 37 ms. I hate the idea of the wireless sub, but even SVS has a unit:
https://www.svsound.com/products/soundpath-wireless-audio-adapter?variant&wiz_medium=cpc&wiz_source=google&w iz_campaign=7976685774&wiz_term=&gclid=Cj0KCQiAyp7 yBRCwARIsABfQsnTrxn4HWa3JSfGdUYnv5X-BHZog5vJjafGjP5xep6Cz_3l-XhlBU1gaAu5_EALw_wcB
(the above has 25.5 millisecond of delay which may not be enough if you don't have a minidsp HD capable of 80 ms delay). And finally the notes for LG OLED:
"the Oppo and the Apple TV 4K. 4K Dolby Vision content goes out of sync and they both have a 126ms delay. I strongly believe the that LG TV itself is at fault. My LG is a C6"
"Its the LG OLED's 'Real Cinema' option in the picture menu. The trick is that the option is greyed out (not applicable) with anything except 24p content, so you can't always reach in to turn it on/off. But if its ON (and you must check with each type of source content based on its frames per second...it doesn't 'stick'), then you will get a 126ms picture delay with 24p content. I guarantee it." THIS MIGHT BE A GREAT WAY TO ADD VIDEO DELAY FOR XBOX UPMIXING, BUT I'VE NOT THOUGHT IT THROUGH." if you play a Dolby Vision disc, Real Cinema on the TV get's turned on automatically and you can't turn it off!!
This must be a Dolby Vision requirement."
" Sadly, the audio delay setting on the Oppo does nothing with DV discs, so you can't correct for it on the player.
Also, you can't access your AV Amp's audio delay setting while a DV disc is playing (again, must be a DV requirement), so you can't correct it there either!!!
However, as long as you add around 126ms of audio delay on your AV Amp BEFORE you play the DV disc, you will get perfect sync."