Stereo out audio to a Bluetooth device ?!

I advice to put another monitor option. So furthermore the 4 A/B/C/D monitor i would like view a Bluettoth audio send to another device like the audiocar in my garage so i cand make the famous CAR AUDIO MIX TEST with my bluetooth audiocar hifi.

Audio over bluetooth causes to much lag

Lag is unimportant for the application OP is after (car reference test). But this is not Cubase issue. Cubase will happily send audio to Bluetooth audio device if it has ASIO interface. This issue is discussed in previous topic:

pro tools on APPLE active the airplay so you can hear the audio signal on every periferic in the houseā€¦