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Recently got the Grom BT3 kit that comes with a microphone. My car has DSP and I know because the amplifier which sits behind the battery has a coax cable. I got the DSP adapter and hooked up the GROM to the 3 pins and coax cable and my music worked. I then installed the microphone and did a test call. No buzzing or whirring on my end so I can vouch for GROM. Although quite expensive it does give the benefit of using the steering wheel controls to control music and calls. To connect the microphone I fished it through the left subwoofer small space to the back of the trunk and connected it to the GROM. Tucked it inside the center console so no cables stick out and planted the microphone on the steering next to the OEM mic.
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