[Q] Bluetooth sound small topic

Hi, just wondering if anyone know how to make the high bluetooth sound to stick?? Seem to me when it is connected to my car audio, the volume sound is very small.....I have to push the vol up (and it comes with that warning sound) and the volume will play ok. Problem is I have to do this every time it's connected to my car bluetooth. Is there any hack or something that will make it stick by default??? I am already using the sound mod, but to no effect???