I agree. The car is well deadened in many areas. For those areas we can't expect any help from Dynamat. Dynamat can't dampen the already dampened.

That said, the doors can benefit, and the Sound Absorber material and Sound barrier material should help.

I'm pulling the interior rear panels off to upgrade to a 5.25" speaker, mounted behind the panel. While there I'll give the area the full 3 stage treatment. Deadener, Radiant Barrier and Sound Barrier.

I downloaded another app call "db Volume". It seems far more realistic. The SUV doors closed, engine off is 44db, engine on idling is 47db, cruising speeds up to 80 it approaches 56db tops.

Will similarly test the C2.

Scale to understand db readings. 60db is an ordinary conversation.
40db, 1/4th as loud as ordinary conversation
50db, 1/2 as loud as ordinary conversation
60db, Ordinary Conversation
70db, Twice as loud as ordinary conversation

 

That's a good aproach. As you've learned, it takes more than one product to quiet the interior of a vehicle. You fighting multiple frequency ranges, and each product targets a specific range.

Dyynamat doesn't do a lot in these cars because there isn't a lot of panel resonance. Mass loaded materials will do better to actually block sound coming into the vehicle.

I've also considered bedlining the wheel wells, because they do seem to allow a lot of noise to enter the car.

 

This is 5 years of ownership for me. So I think the noise was more acceptable or not even noticed when I bought it. I'm at a point now where I want it to be a little more refined.

Not sure what will fit in the doors.
1. Dynamat - Will fit for sure
2. Radiant Barrier (.375" thick - this might be tight or need to be done partially)
3. Sound Barrier - Will fit for sure.
4. OEM Moisture Barrier - Not sure if this fits or if Sound Barrier can becomes the new moisture barrier

I'm thinking 1, 3 and hopefully 4.

 

BTW. Does your car have carpeting under the seats? I have a '99 and there is NO carpeting under the seats - its just metal. I think they changed this in later years.

 

There is carpeting under part of the front seats but not all. If I slide the seat forward all the way it exposes some metal. I would think yours is the same way right?

 

if I recall correctly, mine looks something like this (pic not from my car). Seems like there is definitely room for improvement.

 

Just to summarize what's been so expertly stated earlier, one of the big misconceptions about Dynamat is that it be used solely to reduce noise. Dynamat primarily dampens or reduce resonance/vibration on the metal panel it is applied to but it should not be used to cover an entire panel. If you want to effectively reduce noise I recommend installing 20-50% Dynamat per panel and cover the entire area with a sound deadening foam cell like material that can be purchased at Home Depot as earlier mentioned or Parts Express. There’s also a CCF material called Overkill Pro from Second Skin. That, with Dynamat reduces vibration and noise.

 

What about the spray on noise reducing materials like Lizzard Skin or undercoatings? How do these products work vs. the other materials?

 

Don't even bother with the foam. Foam is a fine thermal insulator but does next to nothing for sound. Mass is the only true "blocker" of sound. Mass is also not a great idea in your 911 - for obvious reasons. The "limp mass vinyl" products are pretty good, but the caveat is that you would have to cover EVERYTHING for it to really "work" - that would include all the windows...(probably not a good idea). Otherwise, the noise flanks your sound deadening (flanking noise) and renders it useless. Good luck

 

I switched from Cont. DWS to DW, the ride is much better and less road noise.
I do not know what Dynamat is, I am curious. Can some one exlpain what and how it is.
TY

 

I'll be getting this done late next week and will post full results. Pre-Post noise readings in 4 locations of the car. Driver Window area, center vent area, Passenger Window area and on the middle of the rear seat tunnel. No one else spend and possibly waste money until I'm done

Dynamat is basically a rubber/aluminum self sticking vibration absorber. It is expensive because of marketing and branding. That said, the shop doing my work swears by it so I'll just eat the cost on it.

The Radiant barrier (noise absorber) I ordered is this (24ft length):
http://www.homedepot.com/p/UltraTouc...1475/100656747

The MLV (noise barrier) I ordered is this:
http://www.homedepot.com/p/Unbranded...96BX/100663624

I have to agree on tires. I think using a less aggressive tire would help.

 

Would like to know how it attaches. What type of life expectancy.
Also, because I live in NY where the sun shines 6 times a year, will it absorb moisture? Looks like a good product.

 

Same on 2001 coupe. I think Porsche did this deliberately so that you'd hear more of the exhaust sound inside the car. If you want to make it quieter, I would think adding some sound insulation there would help.

 

It's been awhile but iirc there are some drains down there. This wasn't done for exhaust noise and you DO NOT wanna cover up that area.

 

I put Dynamat in there - didn't see any holes and there was nothing hiding anything.