looking at adding some sound deadening to the magna front doors and im finding two types. one appears to be a foam style and the other is the butyl/rubber style.

can anybody shed some light on the purpose/use on these materials. what is better.

im only looking at the items on ebay for the time being as I live in a regional area with no audio shops with a country mile to me.

First thing you want to do to the doors is add mass to stop panel resonanace, deadener with the tar/butyl base adhesive is what you want, thats because the idea is to add mass.

The foam backed product (See Dynaliner) is designed to seperate and insulate, it would come in handy for where the door trim mates to the door skin but thats about it.

Then you have a MLV or Mass Loaded Viynl which is a heavy vinyl material designed to block noise, this goes on the top of the foam backed adhesive and that normally goes over deadener.

You will find 9/10 unless you are really serious that you can stop with the deadener and be happy with that.

Peaandham, with ours cars is there much benefit with going overboard with sound deadening?
ie, can we easily block off road noise or are the cars already well insulated that getting rid of any additional noise will be quite an effort?

First thing you want to do to the doors is add mass to stop panel resonanace, deadener with the tar/butyl base adhesive is what you want, thats because the idea is to add mass.

The foam backed product (See Dynaliner) is designed to seperate and insulate, it would come in handy for where the door trim mates to the door skin but thats about it.

Then you have a MLV or Mass Loaded Viynl which is a heavy vinyl material designed to block noise, this goes on the top of the foam backed adhesive and that normally goes over deadener.

You will find 9/10 unless you are really serious that you can stop with the deadener and be happy with that.

thanks for the heads up. this car will just be my daily driver with a fairly decent system in it. I think I will start on the front doors. its the idea to line inner and outer skins of each doors? approx. how much do I need to order in a pack to do both doors?

regards

Magna's will benefit alot from proper deadening of the doors, and roof more than anything. Speakers in the front doors will benefit most from deadening, sealing the service holes, and replacing the factory speaker mount/baffle with something made of 16mm ply or MDF.

Magna's arent an extremely loud car in regards to road noise, deadening wheel arches will make a resonable difference for about $30 in product, I put a decent piece of MLV over my fuel pump lid (as my pump is really noisy) and that made a massive difference, so in short I think yes, with proper products like Dynamat, Dynaliner and Dynapad you will drop the road noise a bit but for me its not a priority.

For the doors, a door kit of Dynamat will do it, you will need to use a resonable amount on the outerskin (which is the larger flatter panel) as because its flat its prone to resonance. Then on the inner skin (the one the speaker baffle mounts too), you will need less, anything with curves, or ridges in the panel and more sturdy and less prone to vibration and resonance.

With a large flat panel normally 60-70% worth of coverage is enough, you dont need to do 100% of the panel, like I said before you just need to add enough weight.

If you want a decent quality product without breaking the bank go to the AV-DC online store and get yourself a Bulk Pack of Shok Mat, its good, reliable but it isnt the most expensive either.

Peaandham, with ours cars is there much benefit with going overboard with sound deadening?
ie, can we easily block off road noise or are the cars already well insulated that getting rid of any additional noise will be quite an effort?
Just while waiting for a response, the way I understand it; this material helps to minimise resonance of the panels, so where panels are vibrating with sound (from say speakers) they will be work to minimise any undesirable acoustic side effects.

I guess it also provides some sound insulation by reducing the frequency of sound waves travelling through it.
I would have thought that most sound would be getting into the car via the door seams and window glass, although I haven't found these cars to be particularly noisy.

I think this stuff could be useful in the AWD's on the floor panels and firewall to insulate against drive train noise. A lot of work though. I wish Mits had put something in during the build.

You will see some areas in the floor pan where there is a thick built up black substance, this is basically like a deadener.

KWAWD, you are correct.

The idea enviroment would be, sealing all the service holes so that when the air comes from the back of the speaker it doesnt come out and service hole and try to direct itself out around the loose fitting door trim. You want all the air behind the speaker to stay behind the speaker, so the speaker must mate up to the mount100% otherwise any air leak will be obvious in the performance. Like I said you cannot seal the door 100% because of drain holes and whatnot but you can certainly prevent it from coming forward of the speaker.

You can then also make a mount the bring the speaker as close to possible to the back of the factory grille and then pack the minor gap left behind with self adhesive foam.