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I've been communicating with FordEngineer who has been extremely helpful. He doesn't hear the noise on his '10 Premium GT, however, he has navigation. This issue might be isolated to non-Nav Shaker 500 vehicles.
And FordEngineer does have a Shaker 500 and not a Shaker 1000?
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Besides the AM/FM leaking through, there's still a HISS or faint rumble coming through the subs at low volume, no matter what input you are using. I'm sure it's there at all volumes, and it may actually get louder, but it's more difficult to hear it when a song is at a typical listening volume.
Vehicle: 2010 Ford Mustang V6 Premium Pony Package Convertible
I have the Shaker 500 and have the SAME issues. The hissing is only noticeable at very very low volumes (when you can't really hear the music). Once you turn it up it sounds awesome. These are the first set of factory speakers I DO NOT plan on replacing. That says a lot.....
Okay, so after doing some digging with the core radio and sound engineering team, there's some news to share.
The cause of the problem is a Digital Signal Processing (DSP) issue from Clarion (the supplier for the Shaker 500 system), that affects the Audio Control Module. It has already been fixed for Job2 Mustangs (second production batch), but for everyone that has a Job1 Mustang with this issue, it's going to require a trip to the service department.
The problem requires both a hardware AND a software fix, so unfortunately, the entire ACM is going to need to be replaced. I'm not sure if Ford has a TSB out for it or not, so in the event your dealer service rep gives you that glassy-eyed stare, here's what they'll need to do:
Replace the ACM.
Plain and simple. Make sure that they get a replacement part that is a Job2-batch part, so that the exact same problem doesn't get re-installed in your vehicle.
That SHOULD fix the problem. If you have this done, please post and let us know if the problem goes away.
Ford Vehicle Systems Engineer
2010 Ford Mustang GT
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