Transmit to sub

The word you are looking for is latency.  My REL wireless sub has a latency of 8 ms (milliseconds) with no audible distraction.  My headphones with 50 ms latency definitely echo the tv speakers.  Check the latency spec on the bluetooth.  Lower is better (obviously).

I have Been using a Martin Logan sub utilizing Bluetooth transmission for the better part of a year.
Absolutely no concerns or audible delay I have been able to detect.

Do those subs have the BT built in or are you using a 3rd party xmtr/rcvr?

My Martin Logan ( and a few ML models) have it as an option from the factory.
The receiver is built into the sub.
The transmitter is a separate small box that plugs into the pre or sub out of your amp.
They pair together instantly and I have never had an issue.

JL Audio makes a nice transmitter/receiver set for not much money. It will send to 2 subs too.

https://www.jlaudio.com/jlink-trx-home-audio-wireless-kit-96102


regards, Fred