Sound deadening for $45???

[mudvayne9790]

I know deadener will help eliminate sound on the higher end of the spectrum. But low tones still penetrate, but hearing the exhaust will be kinda defined in a way. Since a lot of the other noise is cut out.

took the words right outa my mouth

[Tsukiko]

Such is the difficulty of sound deadening. Low frequencies are incredibly difficult to nail down because of their omnidirectional characteristics and huge wavelengths. The lower the frequency, the longer the wavelength.

Check this out... the human hearing range is theoretically 20Hz to 20KHz.linky for those who want an idea of wavelengths... http://www.mcsquared.com/wavelength.htmI plugged in 40Hz, a bass frequency fairly common in hiphop and electronic music. The wavelength doesnt complete its cycle till its 28.25 ft from its source. s***s crazy.


Modified by Tsukiko at 4:54 PM 12/22/2009

[zach-Ka]

s***s crazy.

That is crazy. Do you think closed cell material would help?

[laxands13]

Do you think closed cell material would help?

Wondering the same thing. RAAMaudio has some of that stuff..

[Ter240sx]

ya i bet thats probably why. oh well ill just use the silencer for long distance interstate driving. and just take it out for track days but yeah i still have yet to do the doors. hopefully that will help some more. gotta drive down to colorado to buy some more.... wyoming sucks just FYI... don't ever move here haha

[zach-Ka]

Just order it online and get it sent to a store close to you

[georgegto]

Lets make this thread sticky?

[SirSilvia]

Lets make this thread sticky?

[Tsukiko]

That is crazy. Do you think closed cell material would help?

As far as the low frequencies from a 3" exhaust, I would have to lean towards not very much. As large as the frequency waves are, I think it would be a bandaid on a bullet wound. Keep in mind the speed of sound is constant across the frequency spectrum, at least in a vacuum. Wind will play a small factor.

I really want to hop in my car with an RTA and analyze the frequencies in my car. I kinda wish I hadnt put down the rubberized coating in the rear of the interior. Just for a before and after. I wonder if the frequencies are low enough from my exhaust that it would simply engulf the car. We all know a KA with the right exhaust has a pretty deep tone.

[SirSilvia]

Yeah that's a good idea.I wanna get readings from stock to stripped, to deader.

[zach-Ka]

That would be interesting to see.

I kinda wish I hadnt put down the rubberized coating in the rear of the interior.

Did the rubber undercoating help any? I am figuring that the spray on sound deadening cant be far off from rubber undercoating.

[SirSilvia]

i believe WC did the entire underside of his car in bedliner/hard rubber coating.

[Tsukiko]

It did help a great deal, but not quite as effective as proper sound deadener. I didnt put the coating on for sound reasons to begin with, it was just kindof a bonus.

I still plan on re carpeting and putting in some stick on deadening as well.

[zach-Ka]

i believe WC did the entire underside of his car in bedliner/hard rubber coating.

I wanna do it to prevent rust anyway. I think I am gonna do this while I have my trany out.

[Ter240sx]

do you think using that peel and seal stuff on the underside of the car would work as well? or only that spray stuff?

[zach-Ka]

I see it falling off due to weather and wind. I would just spray it.

[eight4]

This is one of the most awesome threads I have stumbled upon by accident. I wish I had heard of this stuff 15 years ago when I first started doing budget stereo installs.

A note on spray on rubberized undercoatings though: I wouldn't advise using anything specified as an undercoating on the interior. Yes it will dampen sound and even help with some rattles ... but it does get a little sticky/nasty when it gets warm out. I never noticed a smell with it or had it scrape or peel off though.

Cheers

[Cone Junky]

Found the same stuff under a different name at Home Depot-











These are pics of me using it in my GTI. I noticed a SIGNIFICANT drop in road and exhaust noise. It took about 3- 3.5 rolls to do the trunk, 1/4 panels, and front door panels. I imagine it will take another 1- 1.5 rolls to do my complete roof and pillars next.

WARNING- some people mentioned that there is no odor, but I have noticed the odor everytime I get in my car. It smells a lot like gear oil, but a worthwhile tade-off in my opinion. I'm hoping that this summer it will get worse and then fade away from the temp increase, but not sure.

[zach-Ka]

You noticed a difference by only putting that much on your doors?

[mudvayne9790]

lol thats what i was thinking looks like he put more on the inside then the side that probably needs it more idk if that makes sense ill post my pics up of mine in a little bit

[Cone Junky]

Yes. In one of the pics you can see the factory deadening material, it's still a major improvement. Most of the reduction comes from keeping the sheet metal from vibrating, which transfers noise easily and even amplifies it at times. So even the 70% coverage I did makes a large difference on killing vibration. It's obvious every time I open my door or tap on the exterior sheet metal. Just a dull thud. The trunk and wheel wells got closer to 90% because of the exhaust and road noise. I'll probably do closer to 95% coverage on the roof and c-pillars. Those take a lot of direct heat, so complete coverage is ideal for temperature insulation and sound deadening.

I also didn't have the patience to do a seamless job. The few pieces I pre-cut lost shape quickly once they were applied. It does really well for conforming to all angles and dips, but it still changes direction and length. So you end up with a lot of weird shaped gaps. I'm too old to spend more than an hour hunched over in the back of my hatchback. So that's what it got.

I also used it to fix a leak in my rain gutter

[mudvayne9790]

lol yea he put must of it on the inside should deaden sound from outside but i would think the speakers would make the part people usually do (the part u kinda skimped on) vibrate since u only put a few patchesso heres mine





passenger side that i ended up redoing so it looks like the driver door but i forgot to take pics after i redid it





the speakers i put in (alpine)



it prolly took one roll to do both doors if i didnt do the passenger side again

gonna do the trunk when i get some time

[zach-Ka]

Looks good, were you able to tell the difference?

[mudvayne9790]

definitly + the door just feels sturdier

[zach-Ka]

Thats my favorite aspect of it all.BTW I love your picture, I havent played that game since like 3rd grade.

[mudvayne9790]

lol thanks thats the name of my car (Slippy) got the idea when i saw the chuckies check in thread. it reminded me of the game"slippy checking in" lol plus it goes with my drift dream

[Cone Junky]

lol yea he put must of it on the inside should deaden sound from outside but i would think the speakers would make the part people usually do (the part u kinda skimped on) vibrate since u only put a few patches

Yes I did the outer skin of the door. After all, that is where the traffic and road noise comes from

Besides my stock 5.5" speakers don't cause any vibrations while listening to talk radio. The less outside noise you hear, the more inside noise (that radio thing) you hear.

[zach-Ka]

Haha, Awesome! Mine is just named after the lady I bought the car from... Denise. It's not cool at all. haha

[mudvayne9790]

ahh i see i guess i have a one track mindset since i wanted to reduce speaker vibration not so much road noise

[zach-Ka]

I was more after the road noise and ended up helping my stereo system in the end...