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Bavarian Soundwerks' Mobile Electronics Forum
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Old 12-26-2006, 01:30 PM   #21
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Do all H/K subs look like that? I have an '01 330i with the H/K sound system and it looks nothing like that under my back deck. I do have an aftermerket head unit though so maybe the PO replaced the subs too. I don't have any rattle either which I guess supports the theory that what I have isn't stock...
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Old 12-26-2006, 02:06 PM   #22
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Mine's definitely different, but it still looks factory... Just took a quick cameraphone pic. It has a couple of larger speakers on each side instead of one large unit in the middle:

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Old 12-26-2006, 02:26 PM   #23
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Do all H/K subs look like that? I have an '01 330i with the H/K sound system and it looks nothing like that under my back deck. I do have an aftermerket head unit though so maybe the PO replaced the subs too. I don't have any rattle either which I guess supports the theory that what I have isn't stock...
No, sedans like your 330i have two sub boxes rather than the 1 single enclosure in the coupes. My 328i has almost no rattle while my ///M rattling is driving me nuts.
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Old 01-30-2007, 09:50 AM   #24
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is there any fix like this for a non HK system? or maybe something similar to the bolt fix for a non HK? Thanks in advance
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Old 01-30-2007, 12:47 PM   #25
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The rattle id due to the rear deck bouncing and not being properly secure by the retaining clip provided by BMW. The best fix is to buy the soft velvent tape, it is sticky on one side and the other is a thin velvet like material. After you line the outter edge of the rear deck then you can use a single nut and screw to secure the rear deck down to the front, it provides more support. When i did my rear system I removed the Rear HK subs all together, one becaue it was in the way, two because my new subs would make it obsolete anyways, and three, well there is no three. Any how I will take updated pictures of the bolt im taking about.

BTW my HK OEM subs with out the OEM amp is forsale.
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Old 01-30-2007, 02:51 PM   #26
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nice writeup
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Old 01-30-2007, 03:08 PM   #27
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yea pictures of what you speak of would be great AzCamel. Thanks.
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Old 01-30-2007, 04:28 PM   #28
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Great writeup!
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Old 01-30-2007, 04:49 PM   #29
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Has anyone tried dynamat? I had a similar problem in one of my E36's....but I also had a pair of 12's in the trunk.....I used dyanmat to cure it...

Just curious if it would work in this application....
That was my solution...



... use Dynamat to cover the whole underside of the rear shelf cover panel (1), specially the rear plastic vents (2) close to the rear window. I used thin strips of Dynamat under each individual vent section to make the whole cover panel assembly heavier, thus less vibration, no rattling at all.

Even there is some Dynamat in the rear speaker's grilles (9) (in the Harman Kardon aluminum-look strip) that I found that they rattled a little bit after installing the Stealthboxes.

No more rattles at all from the rear shelf. The same at the front door panels, Dynamat completely the suckers too:

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Old 02-01-2007, 02:38 AM   #30
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Technic,

What components u running, on the door panels. And rear for that matter.
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Old 02-01-2007, 10:52 AM   #31
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I will like to know how to stop the rattle from the muffler heat shield.
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Old 02-02-2007, 09:32 AM   #32
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Is the HK sub tapped off from the rear deck speakers? My sub is not working any longer... I test the sub itself and it works, but it is not receiving audio from the head unit. I think that when I put the batting in there, I may have disconnected some wires connecting the subs to the rear deck speakers. This is the only conclusion I have come to since my sub stopped working... any of you have experienced this problem?
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Old 02-02-2007, 09:53 AM   #33
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Is the HK sub tapped off from the rear deck speakers? My sub is not working any longer... I test the sub itself and it works, but it is not receiving audio from the head unit. I think that when I put the batting in there, I may have disconnected some wires connecting the subs to the rear deck speakers. This is the only conclusion I have come to since my sub stopped working... any of you have experienced this problem?
OEM subs are driven by theit own/separate miniamp. Check it out, that's where your problem must be...
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Old 06-22-2007, 03:50 PM   #34
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Thank you soooo much. I performed this fix a couple days ago and everything went exactly like you said. It was easy and the rattle is completely gone. I think the bass sounds a little crisper even.

For you to go out of your way like that for the benefit of others and get nothing in return renews my faith in humans. (Not to get to cheezy or anything)



Now if I could just get my AM radio reception to work.......
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Old 06-22-2007, 03:55 PM   #35
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This works well also!

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Old 09-14-2007, 02:53 PM   #36
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The dealer's fix never did work for me. I finally broke down and took a shot at fixing this myself. Now I hate that I waited!

Since the goal is to stop the deck itself from resonating I used the bolt method. It never made sense to add more insulation. All that does is deaden the sound. The bolt method worked like a charm. I found some of the dealer’s old insulation, now unglued, under the deck. I took a piece of that to cushion the bolt against the deck. Worst case the insulation will break down and I can replace it or adjust the bolt. I can’t see how I’ll ever worry about it popping through. Total cost, 70 cents for one bolt and two nuts.

I do wonder about one thing. When I removed the sub woofer it looked like someone had drilled holes in either side of the plastic housing. I see them in the pictures on this post but this car also appeared to have the dealer fix. Can anyone say was this part of the dealer fix or how the subwoofer came from the factory?
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Old 09-19-2007, 12:37 AM   #37
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For those that do not have the oem SUBS (fr. the HK system), use old t-shirts. There are DYI instructions on how to do this on this forum.

The key is to get the T-shirts/whatever you feel like using, allllll the way in so it pushes the entire deck up a little. Use a rod or something stiff and thin. Push the shirts so they end up right where the rear windshield and the trunk meets (at the bottom)...

To give you a larger gap, unbolt the 3 bolts (w/ covers) on the deck...

I did this last night, and it worked like a charm. I'm so happy.

F**king rattles!
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Old 06-05-2008, 12:03 PM   #38
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Great write and thanks for the pics. I put a pound of poly fill in and its seems to be alot better. Im adding subs so I may need more work back there we will see.
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Old 10-01-2008, 05:22 AM   #39
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i will do this in near future. I put in sponges in small holes without removing hk sub. It was pain in the ass to get sponges in through that small holes. Maybe next weekend or one after I'll remove sub and put in lots of sponges to keep that deck without rattle.

What do you think about sponges? is it ok material?
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Old 10-23-2008, 06:35 PM   #40
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thanks a millions for the info, finally i can turn on my stereo and not cringe
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