Tipper Posted December 11, 2017 Share Posted December 11, 2017 Hello, I recently purchased a 2017 MKZ with the Ultima system and so far, I've brought the car in because of excessive vibration/rattling in the doors. I purchased an app for my phone that will play all the Hz's of bass and treble so I could trouble shoot what exactly is going on and not have to wait for that certain part of the song that makes the noise. Upon further inspection, I noticed the rear door lowest speakers (there are three) on both sides aren't emitting any sound. They should be just as loud as the front door speakers am I correct? The fader is in the middle position too. Could someone with this same system check theirs just so I know what is correct? Thanks! Quote Link to comment Share on other sites More sharing options...
drolds1 Posted December 12, 2017 Share Posted December 12, 2017 Post moved to appropriate forum by moderator from Lounge. The Lounge is intended for off-topic discussions. Per the header there: This forum is not for technical and modification discussion. If you need to post a mod & tech question, please post in the appropriate section. Quote Link to comment Share on other sites More sharing options...
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