Just got off the phone with Samsung support. I am coming from an S4 Mini. I have an MPow 3.5mm Bluetooth Dongle that i use to connect to S4 to my vehicles head unit. I have noticed with this new S7 that i have to have the head unit volume 75% or more to get the same volume from the audio being streamed as I did with using the S4. I have a Sony Bluetooth head-unit in my motorcycle and I have no issues with that at all. The support guy said it's a compatibility issue with the s7 and the Bluetooth dongle. I've read about others having this same volume issue on-line as well. If it truly is a compatibility issue, how do I know the next bluetooth dongle receiver I order won't have the same issue. Is there a Version of Bluetooth a guy can check on both the phone and an accessory receiver to be sure it will work properly?