Transmit to sub

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.

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.