stalintc Posted March 28, 2012 Share Posted March 28, 2012 I am in the process of retrofitting a 2010 nav unit into my 2.5i. One thing I would like to investigate is using the overhead microphone instead of the built in one (front upper left corner on HU). I ordered an overhead console which had the microphone and did some investigation. Here are some pics: Here is what I have found so far: Red: +4.8-13.8Vdc Black: Ground and audio reference White / Blue: Audio I measured a 1kHz sine at about 85dBA into the mic and saw +/- 1.2Vpk on the audio wire. The dc input will function at 4.8 - 13.8Vdc. I did not test further outside of that range, but at 4.8v I saw a very slight reduction in peak voltage output on white/blue. From what I can tell there is a dc-dc converter which takes the input and knocks it down to 5.5Vdc. It then feeds the dual opamp that is on there (2732817 JRC). The rest looks like passive components for filtering. I am curious if there are mic inputs on this head unit, and if so does anyone know which? If not, I figure I can attempt to trace the wires on the built in mic back to the preamp and tap in there. Otherwise, for aftermarket integration this thing looks pretty easy. I did find that in my car (2.5i non premium) the harness to the overhead console had the mic wires populated, however I did not test to see if there was power, nor where they went. I hope this is useful. Link to comment Share on other sites More sharing options...
Magic Marker Posted March 28, 2012 Share Posted March 28, 2012 Interested to see if you can get it to work. I would think the overhead mic would be better than the stock HU location. 2011 Volvo S60T6 & 2013 Volvo XC60T6 Polestar Link to comment Share on other sites More sharing options...
stalintc Posted March 29, 2012 Author Share Posted March 29, 2012 I would hope so. My only concern is if there is echo cancellation built into the head unit. If so, the delay from the new microphone position would probably make it a no go. I hope to find out. Link to comment Share on other sites More sharing options...
DeltaNu1142 Posted May 3, 2012 Share Posted May 3, 2012 I found this thread looking for tips on microphone location. I'll be installing my Pioneer AVIC this weekend. In my Tundra (different AVIC head unit) I placed it in the factory location in the headliner. In my LGT, I've got a moonroof, so I don't believe there's space. Tits mcgee Link to comment Share on other sites More sharing options...
stalintc Posted May 3, 2012 Author Share Posted May 3, 2012 I believe there is. From the pictures I saw in the microfiche (who knows the validity of them...) the difference between the non moonroof and moonroof was the placement of the switches. But again, please feel free to correct me. Link to comment Share on other sites More sharing options...
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