That could even be an incompatibility between the Bluetooth & codec implementations in your player device and headphones. APT-X-LL was meant to be a "low latenc

That could even be an incompatibility between the Bluetooth & codec implementations in your player device and headphones. APT-X-LL was meant to be a "low latency" codec but I think there's some obscene per-device fee to implement it. If you can be bothered, it's possible to enable a Bluetooth debugging mode on Android and see which codecs are being selected by dumping a file into Wireshark (!) The lowest common denominator codec will be SBC, and I don't think there's any latency guarantees there. Yeah, Bluetooth, totally simple.