So I’m going to resurrect this thread a bit and report back with a few interesting findings. But I found a good solution!
@MadGman I have to thank you for pointing out some component along the way may be adding latency, because that’s exactly what it was! It was the Avantree Oasis funny enough, something that advertises low latency adds ~100ms of latency even while in LL mode. In contrast, I got this TaoTronics transmitter and wow, what a difference in latency.
I started an Audacity project to measure latency among all of my sound devices because I was intensely curious. Methodology was to have a “master” track of solid, short ticks, and record with my Elgato Wave microphone. Recording and playing the master track provided a consistent way to measure latency end-to-end, so with a wired headphone as a control, it’s easy to see how much latency various BT codecs give.
With this TaoTronics adapter instead, AptX LL only adds ~7ms over my BTR3K wired in! Even more astounding is my Sony XM3, which supports AptX (non-LL) has less latency than LL on the Oasis. What a piece of junk lol.
Only downside I see so far is reception is slightly less than the Oasis. Very occasional microsecond clips in audio if I’m moving around or something, but sitting still, audio is perfect.
Also, something else I noticed is there’s some minor static if the transmitter is plugged in and using 3.5mm audio. Using optical mitigates it, if not completely eliminates it. Which makes sense since there shouldn’t be any analog conversion with optical.
@RiceGuru If you’re still searching for a solid wireless solution, give the BTR3K + the TaoTronics transmitter a try! You can disable AptX HD on the BTR3K app if you pair it with a phone, so it’ll default to LL, or you can disable HD on the transmitter too by holding down the bluetooth button for 7 seconds, according to the manual. This combo is right on par with other wireless headsets out there, even faster than my MH670!