A:Answer Hi Ripper1,Thank you for your inquiry! If your Car stereo supports A2DP Bluetooth connection (Transmission), it should work with the SRS-XB43 Speakers. Bluetooth A2DP (Advanced Audio Distribution Profile): Enables transmission and reception of high-quality music contents.
However, most car stereos that have Bluetooth in (BT Receiver). This is for connecting a player, such as your phone, and not for sending audio to wireless speakers (BT Transmitter).
I hope this helps!
-Carl