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Faults, Fixes and DIY Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix!


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Old Mon, Apr-18-2011, 01:52:54 AM   #1
roarf
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Default DIY: Tennis Ball Mod

I haven't seen any official DIY for this. I know there's not much need for it since it's pretty straightforward, but I've seen a number of people ask for pictures. So, here's a quick DIY with some pictures I took while I did this today. It only takes maybe 20 min. if this is your first time doing this but it is quite effective!

The problem: Excessive vibration/rattle, etc. from rear deck shelf for those with HK sound system.
The solution: Tennis balls.
Tools needed: 8 mm socket or nutdriver, flat head screwdriver or plastic pry tools, 3-5 tennis balls.

Step 1: Open trunk and fold down the rear seats. You don't have to lay down in the trunk but I did to make it easier on my back. With the seats folded down, climb in the backseat and lay down in the trunk with your head to the back of the car and feet inside the car.

Step 2: Unscrew 4 screws (8 mm) holding HK speakers in place, as indicated by yellow arrows. There are 2 towards the rear of the car and one on the left and right side of the unit. The unit should NOT drop down once you undo the last screw, but brace it just in case.



Step 3: Unclip white clips. These are very similar to the type of clips used on the door panels. Grab a flat head screwdriver or even the plastic door panel pry tools if you have them (I do but didn't think to grab them). Pry as close to the white clip as possible so as to avoid stressing the black plastic of the speaker unit too much. It takes a little force but the white clips will pop right out. Disregard the fact that the screw is still in place, I took this pic after I was done.





Step 4: Once both white clips are popped out the unit will slide to the rear of the car slightly and drop right out. The tabs indicated by orange arrows are what hold up the backside of the unit. (see picture) Unplug wire harness as indicated and set the speaker unit aside.



Step 5: Next, get your tennis balls. Shove one into each hole as far to the left (and right) as you deem necessary to put sufficient pressure on the deck. You want the tennis balls as far to the back of the car as possible so that the back of the deck is pushing up against the rear window and can't vibrate.

One on the left...



One on the right...



And one in the middle.



Step 6: Reinstall everything in reverse order. Plug the wire harness into the speaker unit, slide the rear tabs up into the top of the trunk, and snap the white clips back in. Screw the 4 screws back in and test your work! Now that you've removed and reinstalled the speakers you know what to do if you ever need to make an adjustment.

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Old Mon, Apr-18-2011, 01:58:10 AM   #2
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Default Re: DIY: Tennis Ball Mod

Great DIY, I did this recently and was shocked that it actually does work!
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Old Mon, Apr-18-2011, 02:28:11 AM   #3
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Default Re: DIY: Tennis Ball Mod

random
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Old Mon, Apr-18-2011, 03:27:42 AM   #4
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Default Re: DIY: Tennis Ball Mod

Does it look different on the inside of the car after the balls are in there?
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Old Mon, Apr-18-2011, 03:50:04 PM   #5
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Default Re: DIY: Tennis Ball Mod

Quote:
Originally Posted by Mike V View Post
Does it look different on the inside of the car after the balls are in there?
Not that I can tell. I forgot to take a 'before' picture, but I can get an 'after' picture later for reference. There is no bulging in the deck where the tennis balls are sitting.

Quote:
Originally Posted by CoulterM View Post
Great DIY, I did this recently and was shocked that it actually does work!
I know! I turned the bass all the way up and cranked the volume up louder than I would normally put it and still no vibration.
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Old Mon, Apr-18-2011, 07:31:56 PM   #6
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Default Re: DIY: Tennis Ball Mod

I have the rear sunshade option on my car, will the t-ball still fit?
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Old Mon, Apr-18-2011, 08:40:13 PM   #7
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Default Re: DIY: Tennis Ball Mod

I've had the car a month and it's by far the most annoying thing to be unable to listen to rap because of the vibration.

Thanks for this.
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Old Mon, Apr-18-2011, 09:23:53 PM   #8
mmm def
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Default Re: DIY: Tennis Ball Mod

Thanks for this!
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Old Mon, Apr-18-2011, 09:44:38 PM   #9
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Default Re: DIY: Tennis Ball Mod

I'm gonna run to Big 5 on the way home...
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Old Mon, Apr-18-2011, 09:56:16 PM   #10
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Default Re: DIY: Tennis Ball Mod

hey is there any solution to the rattle the subwoofer makes for the verts?
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Discussing DIY: Tennis Ball Mod in the Faults, Fixes and DIY Forum - Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)