2011 Mustang SYNC OEM Mic Retention

Group using the FO1 and FO2 firmware for Ford SYNC retention * see specific firmware for full feature list.
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DonJuan692006
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Joined: Tue Jul 30, 2019 2:11 pm

2011 Mustang SYNC OEM Mic Retention

Post by DonJuan692006 » Sat Aug 03, 2019 11:23 pm

Hey folks,

Finally got around to upgrading from the stock HU in my 2011 Mustang GT with the Shaker 500 and SYNC. Popped in a Kenwood DMX906S with the Maestro. The Maestro and HU install was pretty simple and seamless following the awesome instructions for the RR, but I wanted to retain the factory mic.

So, I followed the guidance here viewtopic.php?f=396&t=9284&start=15#p37623 but quickly learned there were problems. I did a few test calls with my wife. She could hear every sound from the car, including her own voice coming from the speakers.

I realized the gain on the mic was too high. A little Google-fu and the consensus is that the majority of OEM mics are active with a built-in amplifier. Since pretty much every HU mic is passive, the HUs are incapable of compensating for the amount of volume coming from the active OEM mic. So, I figured it'd be a quick job to pull the mirror apart where the OEM mic calls home and bypass the amp; wrong. The amp and mic are part of the same integrated board which has a multi-layer PCB making it impossible to trace the circuitry without a lot of patience and time; I'm short on both.

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So, after chewing it over for a while, a simple solution popped into my head. I basically just need to turn the "volume" of the mic down, if you will. Off to Amazon we go and picked up this guy: https://www.amazon.com/gp/aw/d/B071VL2G ... op?ie=UTF8.

Plugged it in-line and made a test calls. Within a minute or two I was able to get it dialed in to still clearly pickup my voice, but eliminating the excessive background noise. Some 3M double-sided tape and it's got a permanent home with the knob still accessible for tweaking. Right above the radio on the right in the photo.

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After some extended road testing, I'll hot glue the knob in place and call it a day.

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