[QUOTE=Asbjrn]
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Originally Posted by laz4
Ok so I realized something. The center dash speaker is not actually producing distorted sound. The culprit is the grate I've the speaker. When pressing down on the grate while playing music, the distortion is no longer present. Seems that it's not distortion but a really horrible vibration that sounds like a broken speaker. I'm still pretty amazed that BMW would put a speaker in a location where the grate could not be secured more solidly.
I guess my next step will be to visit the service center to see if they will tighten the grate.
I suggest others on here with the same experience with distorted sound attempt pressing on the grate and reporting back their experience.
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+1 excellent find! Modern loudspeakers really should not produce audible distortion when new. I always wanted to check if something in the dash was indeed vibrating on those piano tracks, but never got around to do so.
Please take pictures of how they tighten things up!
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I wouldn't expect to much from tightening the grates, the vibration comes from all of my front speakers. This seems to be a design flaw. The speakers just seem to be nested in less than dense areas. I'm afraid that the vibrations will persist but I'm going to give it a shot. I don't know about everyone else, but the rattle on mine is to an embarrassing degree. 14 speakers that work together to produce a bunch of "premium" buzzing. Bach rolls over in his grave every time I play any of his piano compositions.