Trying to break the bonds of wired communications, so this is my first foray into Bluetooth and need some help. I have just purchased the Schuberth C3 and SRC system and I have a Garmin Zumo 550. I initially tried pairing my phone to the Zumo and I have an SD card with tunes on it. I figured this was the best set-up. I quickly found out the Zumo 550 does not play in stereo and it will play music and provide voice GPS instructions, but when a call through, it locks up or crashes. So I paired my phone where my tunes reside to the SRC to get stereo, but then I loose connection with my GPS. I understand the Zumo 660 & 665 have the newer Bluetooth protocols to achieve stereo, but was wondering if either of these units will play music, give GPS directions and receive a phone call without shutting down or crashing. Thanks.