This has been an interesting read and I applaud those who have done this. Our 2005 sienna has a groaning engine noise since brand new. Not sure if later models introduced more road noise. Would be nice if Toyota would sell a luxury version of the Sienna with less road noise, noise cancellation in the speakers, etc.

 

Can you tell us what MLV, CLD AND CCF IS .?

 

Got Google? There are numerous resources on the Internet about this stuff ... including http://www.soundsolutionsaudio.com/forum/topic/72781-how-much-cldccfmlv-for-my-car/

 

hey new to this. how did you remove the rear 3rd row panel? ive been trying to get it off for 3 months now. Thanks!

 

Hi Frosty,

MLV = mass-loaded vinyl
CLD = constrained-layer dampening
CCF = closed-cell foam

The best sound deadening products have high mass/area for broad-band attenuation down to low frequencies, and high loss factor for high dampening. IIR rubber (essentially butyl) is great for this. Note that low mass/volume can be fixed with high thickness. Btw the OEM often puts a patch of mass with dampening in the center of the door to get a nice 40-ish Hz "thud" when the door closes. I believed Shien posted a photo that showed an example of that.

Foaming a material is unhelpful for sound attenuation because the cells are filled with air, and air has low mass/volume (1.18kg/m^3.)

Incidentally, maybe the most effective noise-deadening material on the planet is lead. And of course, the stuff is heavy, by intention. Some OEMs use more than 100lb of sound-deadening materials in their luxury vehicles. About mileage: fuel economy goes very roughly as the reciprocal square root of mass, so if we add 40lb of mass to a 4,500lb Sienna, we should expect very roughly a 0.5% decrease in fuel economy.

HTH,
mapirc

 

I cheap out with my 06 LE. I use a pair of squeeze type ear "dickies" then slap on my Bose noise cancelling headset. I have to be aware of local state laws waering headsets while driving. One day though I would like to take my panels off and deaden with appropriate materials.

 

Hi Paul - I own those (QC3) too (in fact, I know the people who designed it.) Yes, to the precaution about local ordinances, and ANR headphones reduce audibility of all exterior sound, so needful audio cues while driving will be suppressed. Then we have the basic encumbrance of wearing headphones. I agree best to treat the vehicle...

 

Has anyone used 80 mil. Kilmat?
Did you have good results?
Do you have to use a roller or will pressing it down with your hand work ok?

 

if you want to use original microphone on aftermarket solutions here present circuits

Solution, How to connect original Microphone of Sienna...

Hello All! I bought Teyes CC3(6+128Gb, Androin 10) head unit for my Sienna, All work prefect (mobile internet connection and data sharing, sond y etc) but i not like sound of Teyes microphone for handsfree. So i found solutions how to connect Native microphone of Sienna to different Chineses...

www.siennachat.com

 

This is huge project Shien! Noise bugs me too. I started this project then had a local audio shop do the rest. I didn’t think of the B pillars though! I’ll have to take a look at insulating those. It sounds like stuffing insulation in there worked? I used thinsulate in some places in the van so that is what I’d use.
Regarding engine noise, there are pads for installing in the hood of the car that are supposed to reduce noise. Like this one:

https://smile.amazon.com/Design-Engineering-050130-Under-Hood-Acoustic/dp/B0055VTOBA/

 

Shien, thank you so much for this write-up! I noticed the photos you linked in post #20 did not link correctly? I am finally ready to tear things apart and start deadening, but I wanted to start at the front and actually seeing the pictures you intended would be so great! Would you be so kind as to see if you can fix those photos or otherwise repost them for our benefit?

Again, so appreciative!

 

An abbrevation a
nd anachronism dictionary would have been helpful in decipering this information. No disrespect intended.

 

Click on a persons name and you can see when they joined and when they were last on the site. In this case Shien hasnt been on this site since the year he first posted, which is 2012 so I dont think he'll be back.
The links to his pics are probably broken. When forum sites do upgrades most all links in older posts get broken. It sucks but it seems to be the same thing on all of them.

As for abbreviations and what they mean, scroll up to post 81. Or you can google it too.

 

I got my XLE on March. Great car so far and quiet most of the time. However, the noise can be really loud depending on the condition of the road and surrounding cars. So I decided to try out sound deadening solution.
After many reading, this is my approach: CLD tiles on the outer skin. .5 lb/sql MLV with self sticking CCF on it.
I'm planning to do front wheel well, firewall (hopefully) front door, sliding door(hopefully) back quarter, rear hatch and trunk.

After removing couple parts the manufacture sound proof material revealed: some damper on the outer skin functioning like CLD, some damper glue on the floor and trunk, some foam and fabric. Fairly insulated. Floor matting is thick. I mean really thick. Maybe around 1.5-2 inch thick!

The problem now is: the damper is minimal so the door and panels still have resonance. Foam and fabric can absorb noise but doesn't block them. Both front and rear wheel well does not have any damper and can cause some sound vibration.

First thing I do:
wrap the rear wheel well with Dynamat. This makes a BIG surprise. The road noise dropped. The sound is depressed and feels deeper.

Then my Raamat order and MLV arrived. My next thing done:
Rear hatch with 50% Raamat, MLV with CCF using Velcro to stick on. Licence plate using Ensolite for padding.
Rear quarter with 50% Raamat. MLV with CCF. The right side only covers 70% of the rear quarter due to the tool set and the air intake for the rear AC. The right side covers to 90% of the rear quarter.
I tested on highway and feels the noise are now moving forward! Back is much much quieter.

Rear speaker is oddly shaped and have shallow space. Planned to get some nice one since I take off the panel. However there isn't any available bracket on the market to fit the odd shape. So, I just use some dynamat and ensolite on the back metal. Great surprise from the stock speaker. The base, mid and high are much clear than before. It is definitely much better than front muddy speaker!

I'll continue my project and will update again.

Cheers!

did you take any before and after sound measurements?

 

Would you be willing to link your products? I’m doing a similar project on my 2018 Sienna wheelchair conversion van.