I appreciate your testing the same this on your devices. I have reached out to them directly before posting the same comment I sent to them as well. There is a slight difference in audio quality as I have noticed. My EQ setting appear like this (), bass being the highest and the highs being the lowest. The audio quality is slightly decreased as I presume the eq settings are changing back to their base setting and change back when connected to my iPhone when connect to it playing music from the phone. When connected to the watch it does not go as loud as it does on the phone and audio quality (noticeably in the bass region) decreases as well. I have done many car audio installations so this small difference is noticeable to me. Thanks again for your testing yet I still remain with the same problem.