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      02-16-2013, 10:06 PM   #23
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Quote:
Originally Posted by laz4 View Post
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.
+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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Little known facts about BMW: 1) The N54 is still in production and used in the current Z4 35i and 35is. 2) In a Z4 you can get sport+ steering combined with normal suspension etc by selecting DSC=off. (Update: DSC=off also offers sports steering in the M135i) 3) All Z4s with 19" wheels are still only offered with the worst performing OEM tires ever sold with a DCT equipped BMW (Potenza RE 050 RFT).
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      02-17-2013, 01:24 AM   #24
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My so called premium sounds like crap too. The rattle on the rear center compartment thing is unbearable when there's bass. Yet I found the best solution is to get exhaust and just listen to the car.
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      02-17-2013, 01:58 AM   #25
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[quote=Asbjrn]
Quote:
Originally Posted by laz4 View Post
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.
Quote:
+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!
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.
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      02-17-2013, 08:29 AM   #26
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Quote:
Originally Posted by laz4 View Post
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.
Actually on mine its mainly coming from the front speakers on the passenger's side. And only on certain "simple" tracks with piano and similar.

It is an option to find mp3s with sine wave sweeps and single tones of different frequencies to help provoke the rattling during trouble shooting. Even high-end loudspeakers can be made to produce some audible unwanted over-tones/vibrations (distortion) in this way. Its only a matter of how much you turn up the volume.

But yes, give it a shot. It may also help to tighten up the screws holding the speakers in place beneath the grates.
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Little known facts about BMW: 1) The N54 is still in production and used in the current Z4 35i and 35is. 2) In a Z4 you can get sport+ steering combined with normal suspension etc by selecting DSC=off. (Update: DSC=off also offers sports steering in the M135i) 3) All Z4s with 19" wheels are still only offered with the worst performing OEM tires ever sold with a DCT equipped BMW (Potenza RE 050 RFT).
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