The BTR17 uses the THX AAA 78+ headphone amp, previously used in the FiiO M23 DAP. The four-channel fully balanced design ...

Also called a "Bluetooth dongle." See dongle. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.

We can’t find anyone else in our archive who’s made a Bluetooth dongle in this way, but we’ve certainly seen sniffing of HCI commands to reverse engineer a speaker’s communications.