Reddit mentions of DiversiTech 6-9718 Foam Insulation Tape, 1/8" x 2" x 30' Roll, Black

To get right to the point their amazing the sound quality is defiantly a bump up even though I’ve had them for only a day now. I sound deadened the door inside behind the weather shielding and the door panel as seen in the imgur. The vocals are much clearer, and the bass is much more pronounced than the under seat subwoofers. Keep in mind the OEM HIFI is 2 OHM’s @ 40 W’s on everything so you’ll need twice as much volume to run the 4 OHM 35 W Helix Match’s I bought (which are getting around 20W at this moment). I’ll probably overtax the amp if I put the volume up too loud but…… I’m aiming for a better amp anyway! *The sound deadening was a big factor I would say in addition to the speakers. I’m you want to know more just look through the below:

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First off, the E90Post is amazing for finding info although most of the products they used are now discontinued and cost a fortune so its up to you to find their replacements. Yes, you can spend a grand or two on some system premade from BAVSound or ... but I still can’t justify it. https://www.e90post.com/forums/showthread.php?t=641323

To find what system you have: *It’s a pdf download before you click

http://www.e90post.com/forums/attachment.php?attachmentid=350502&d=1266451970

Parts so far:

280Pcs SAMOFU Electrical Wire Connectors Kit | Suitable for Marine, Home, Speakers, Various Crimp Terminal Shovel Shapes Butt Connector Kit $11.99 just needed the circle connectors

https://www.amazon.com/gp/product/B07KWX812C/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

DiversiTech 6-9718 Foam Insulation Tape, 1/8" x 2" x 30' Roll, Black $11.49 I’ve done two cars and still have more than enough left for future endeavors

https://www.amazon.com/gp/product/B00SYQ3VNA/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Kilmat 50 mil 50 sqft Car Sound Deadening Mat, Butyl Automotive Sound Deadener, Audio Noise Insulation and dampening $57.99 (25% Coverage before diminishing returns so after two cars I still have left overs)

https://www.amazon.com/gp/product/B0751G6TMV/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Exact Fit Front Speaker Adapter Spacer Rings For BMW Vehicles - SAK076_4-1 Pair $15.48

https://www.amazon.com/gp/product/B01M755KAD/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Helix Match MS 42C Universal 4" component speaker system $99 each so for one pairs (2 speakers 2 tweeters and 2 crossovers) $107 with tax Thanks New Jersey ☹! I had to trim the twitter to fit and needed an adapter to make the 4 point to a 3 point mount.

https://www.amazon.com/gp/product/B00PCLVNJO/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1

OEM wiring so I can revert at any time $11.60 for 4 (2 Pols) and $27.84 for 8 contacts.

BMW Universal Pin Terminal Uncoded (2 Pol) - Genuine BMW 61138373583

BMW Pin-Contact (075mm) - Genuine BMW 61130006664

$11.49 Foam Tape + $57.99 Sound deadening = $69.48. I’ve had this for years and used them for multiple projects so I’m not sure whether to include them. *I’m going to exclude them for now

Spending so far: $107 speakers + 15.48 Adapter + $11.99 Connectors + $39.44 OEM Wiring for front and rear =$173.91 with multiple parts left over for future projects and the rear

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Overall my plan is:

Front Component Speakers: Helix Match MS42C (Not buying the BMW specific kit for $100 to 150 more because I can deal with making a few custom things or finding them)

Rear Component Speakers: Helix Match MS42C (I have OCD so I’m just doing this because… Otherwise I coaxial full range with similar specs would have been a lot better) * I still need to either buy another 4 to 3 mount adapter and custom make a tweeter holder. The BMW tweeter is one piece.

Both Under seat Subs: I plan to just scavenge for some L7 subwoofers since they are more than power for most needs. The HIFI is a 40W on 2OHMs and the TOP HIFI L7 is 70W at 4 OHMs. They run about $80-100 for the pair on ebay instead of the Earthquakes at $200 a pair.

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The speakers I bought can run constantly at 35 Watts RMS without an Issue at 4 OHMs and 105 Watts at 4 OHM for short bursts.

So, from research on the forums I’m good with most amps and won’t damage the alternator due to overtaxing it for power since I’m not trying to do some crazy setup.

In addition the BMW Professional from the Hifi isn’t the best but apparently has a pretty clean signal so a DSP isn’t really need although a audiophile will say so. *AMP and speakers will make a world of difference, go with a DSP if you really want insanity like filtering all the minerals out of your water to wash your car.

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Helix Match MS 42C Universal 4" component speaker system $99 for a pair

https://www.amazon.com/gp/product/B00PCLVNJO/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1

AMP I’m between the Rockford Fosgate R600X5 and the Pioneer GM DX975 since they’ll both fit in the little crevice where the normal amp sits when removed. $200-250 on amazon or scavenging deals. I need 35 RMS @ 4OHM x 4 so 140 RMS Min @ 4 OHM for speakers and 70 W @ 8 OHMs x 2 so 140 W at 8 OHMs or 240 W @ 4 OHMs

https://www.crutchfield.com/p_130GMDX975/Pioneer-GM-DX975.html

4-gauge amplifier power wiring kit $70 I might go cheaper but It’s a critical part so I’d rather not burn my car down

https://www.crutchfield.com/p_007CK4/Crutchfield-CK4.html

BMW E90/F10/F20/F30 Hi Fi AMP Connector Harness $60 to change the stock HIFI amp to a 5 channel or 6 channel *I’m go 5 channel, the 6 channels are way too expensive and rare

(4 channels for speakers and 1 channel for the subs under the seats to make an 8 OHM) *Lower OHMs usually results in worse sound quality. *A 4 OHM amp can run an 8 OHM without a problem just at half the capacity.

https://www.ebay.com/itm/BMW-E90-F10-F20-F30-Hi-Fi-AMP-Connector-Harness/163830179229?hash=item26250a259d:g:OTIAAOSwgQ9V4UKR

Future Spending $107 Speakers + $250 AMP + $70 wiring + $60 adapter = $487

Spending so far: $107 speakers + 15.48 Adapter + $11.99 Connectors + $39.44 OEM Wiring for front and rear =$173.91 with multiple parts left over for future projects and the rear

In total when fully finished this should come out to $660.91 or a little more but I’m left with many parts for future endeavors.

*That's for Speakers, AMP, Sound Deadening, mounts and everything. The bimmertech amp is $900 alone I understanding tuning they've done but dam.

Not that huge a deal.
But, this will work fine. http://www.amazon.com/DiversiTech-6-9718-Foam-Insulation-Black/dp/B00SYQ3VNA
Or find and hvac guy and give him 5 bucks for 10' of it.

http://www.golfmk7.com/forums/showpost.php?p=87891&postcount=24

For me, the soft velcro wasn't resilient enough and the rattle has returned. I'm going to take another crack at it with some foam tape I had previously bought to fix the rear hatch rattle I also had.

Foam insulation tape would work better.

Why are you worried about the icemaker water line freezing - is it outside or something?