Sound Deadening (Dynamat/Fatmat etc)
Discussion
Anyone used this in their cars? I want to get my toy car a bit more soundproof. Spoke to a local car audio place and they said it was the devils work, awful to get off if you needed to and wouldnt offer it to anyone.
Slightly surprised, but taken on board. I still want to do something though, I've got a paid of doors, firewall and hard top I want to line with something - anyone used the above mentioned company's products and would say yes or no?
Slightly surprised, but taken on board. I still want to do something though, I've got a paid of doors, firewall and hard top I want to line with something - anyone used the above mentioned company's products and would say yes or no?
You want foam type material aswell to absorb airborne sound. Dampener matting just reduces the frequency of structural borne noise by making the panel heavier; only really effective if you have a panel subject to resonance at road type vibration and the extra mass moves it out of that region and hence you don't have a panel acting as a speaker.
Generally people put about 6 times more in a car than they need, a few pieces of it in the centre of a panel then spend the money on things like mass loaded vinyl offers better VFM / performance.
Generally people put about 6 times more in a car than they need, a few pieces of it in the centre of a panel then spend the money on things like mass loaded vinyl offers better VFM / performance.
Dynamat is good at what it's designed for - but if you want to reduce road noise it's not the best product.
Dynamat is designed to "stiffen" panels - if you have a beefy sound system, large panels (door skins, roof, bootlid) can vibrate and act like an out-of-phase speaker and kill the harmonics. Dynamat is designed to stop the panels vibrating - but not to actually block out any real noise.
I've used Dynamat on some panels, but what I think works better (from an NHV point of view) is to use layers of foam. You can get proper car stuff for £££, but I've used Cloud 9's Nimbus carpet underlay with good effects (on the floor, stuck to the back of various panels, along the boot floor / wheel well, even inside my PC!). I've also used some "fluff"* to fill crevices around the rear seat / boot aperture.
Dynamat is designed to "stiffen" panels - if you have a beefy sound system, large panels (door skins, roof, bootlid) can vibrate and act like an out-of-phase speaker and kill the harmonics. Dynamat is designed to stop the panels vibrating - but not to actually block out any real noise.
I've used Dynamat on some panels, but what I think works better (from an NHV point of view) is to use layers of foam. You can get proper car stuff for £££, but I've used Cloud 9's Nimbus carpet underlay with good effects (on the floor, stuck to the back of various panels, along the boot floor / wheel well, even inside my PC!). I've also used some "fluff"* to fill crevices around the rear seat / boot aperture.
- I don't know the proper name, but my car has a wool / fluff stuffing that is used in a few places. Breakers have no use for it and so sell it for a pittance, so I bought some for nothing and used it all over.
Tbh it sounds like the shop didn't want the job on as its a load of work to instal and very labour intensive. Takes hours to do properl (days!!)
Dynamat's great but very expensive. I've gone for silent coat for the last 2 cars and can't fault it.
http://www.caraudiodirect.co.uk/silent-coat-volume...
Basically what you need to do is, whip the door cards off, clean any dust or old bits of deadening off the metal then deaden both outer & inner door skins. Some just say to deaden 25% of the door! other 100%....I'm in the 100% club!
Once the door skins deadened you can either leave it like this (but I'd seal up any large panel gaps, just make sure the card will go back on) this will make a noticeable difference but won't stop any outside road noise or passing cars/trucks.
To go a bit further (may aswel while your at it) add some CCF (closed cell foam) over the inner skin. This stuffs just as good as what cad sell imo, and easier to work with.
http://www.foamsolutionsuk.co.uk/self-adhesive-clo...
Once that's done I'd add MLV (mass loaded vinyl) which is heavy sheets of vinyl and really cuts down on noise. You need 100% coverage here to be effective or it's just wasting money. I bought this stuff but there's cheaper around
http://www.deadening.co.uk/collections/mlv-mass-lo...
Then on the back of the door cards I've added this
http://www.caraudiodirect.co.uk/silent-coat-sound-...
So a fair bit of work.....
I'd do the doors, wheel wells/arches and boot first to see how you get on.
Dynamat's great but very expensive. I've gone for silent coat for the last 2 cars and can't fault it.
http://www.caraudiodirect.co.uk/silent-coat-volume...
Basically what you need to do is, whip the door cards off, clean any dust or old bits of deadening off the metal then deaden both outer & inner door skins. Some just say to deaden 25% of the door! other 100%....I'm in the 100% club!
Once the door skins deadened you can either leave it like this (but I'd seal up any large panel gaps, just make sure the card will go back on) this will make a noticeable difference but won't stop any outside road noise or passing cars/trucks.
To go a bit further (may aswel while your at it) add some CCF (closed cell foam) over the inner skin. This stuffs just as good as what cad sell imo, and easier to work with.
http://www.foamsolutionsuk.co.uk/self-adhesive-clo...
Once that's done I'd add MLV (mass loaded vinyl) which is heavy sheets of vinyl and really cuts down on noise. You need 100% coverage here to be effective or it's just wasting money. I bought this stuff but there's cheaper around
http://www.deadening.co.uk/collections/mlv-mass-lo...
Then on the back of the door cards I've added this
http://www.caraudiodirect.co.uk/silent-coat-sound-...
So a fair bit of work.....
I'd do the doors, wheel wells/arches and boot first to see how you get on.
This is all great info, cheers
What I'm looking to do really is take out any amount of road noise and engine noise as well, I'm not looking to build a competition sound system, though hearing the music better would be an upside. I'd heard of Dynamat from people who wanted proper sound deadening, but I think more soundproofing and something that takes up a lot of the external noise would be a good shout.
I'll look into this Cloud 9 stuff. Currently it's just a couple of mm carpet onto fibreglass panels and a hard top that needs a bit more sealing, so I figure I can mount another mm or two of 'stuff' then relay the carpet back on top, fill the doors and line the roof
What I'm looking to do really is take out any amount of road noise and engine noise as well, I'm not looking to build a competition sound system, though hearing the music better would be an upside. I'd heard of Dynamat from people who wanted proper sound deadening, but I think more soundproofing and something that takes up a lot of the external noise would be a good shout.
I'll look into this Cloud 9 stuff. Currently it's just a couple of mm carpet onto fibreglass panels and a hard top that needs a bit more sealing, so I figure I can mount another mm or two of 'stuff' then relay the carpet back on top, fill the doors and line the roof
I wouldn't do the flashband thing again, definitely cheaper but it stunk my car out, made a mess with the butyl backing and took a while to apply.
With the silent coat you just peel off the backing, heat up the back, stick it on then roller it down. Really easy to apply just takes ages to do the entire car.
With the silent coat you just peel off the backing, heat up the back, stick it on then roller it down. Really easy to apply just takes ages to do the entire car.
Jakg said:
Dynamat is good at what it's designed for - but if you want to reduce road noise it's not the best product.
Dynamat is designed to "stiffen" panels - if you have a beefy sound system, large panels (door skins, roof, bootlid) can vibrate and act like an out-of-phase speaker and kill the harmonics. Dynamat is designed to stop the panels vibrating - but not to actually block out any real noise.
Yep - had my doors dyna-matted and it didn't make any discernable difference to road noise but definitely improved sound fidelity - ironically best appreciated when the car is not moving. For some reason people seem to think it's going to make your car like an anechoic chamber when you're on the move, though.Dynamat is designed to "stiffen" panels - if you have a beefy sound system, large panels (door skins, roof, bootlid) can vibrate and act like an out-of-phase speaker and kill the harmonics. Dynamat is designed to stop the panels vibrating - but not to actually block out any real noise.
I'm starting this tonight, going to pad the doors and behind the dash with some laminate floor acoustic underlay foam and put rubber backed underlay on the floor below the carpets. Got some tape as well which will help with the area where the hard top meets the body.
Hard top lining itself can probably come off, it smells a bit funky so I'll change that for something more interesting. I think for me it's just a question of finding the gaps and covering them as much as I can
Hard top lining itself can probably come off, it smells a bit funky so I'll change that for something more interesting. I think for me it's just a question of finding the gaps and covering them as much as I can
griffin dai said:
With the silent coat you just peel off the backing, heat up the back, stick it on then roller it down. Really easy to apply just takes ages to do the entire car.
Agree with this. Very easy to do and the silent coat plus closed cell foam has made a real difference to my Forester front doors and boot. Still got road noise but that is because there is zilch under the floorpan carpet and the seats need to come out to do the job properly.I found this stuff called Quietfloor Plus which looks like it could be effective at shutting out noise from the boot area. There are a few other things on this list too but it's trying to balance cost versus amount.
http://www.soundservice.co.uk/prices_live.php#SBM5
Another vote for silent coat here.
My car came with a load of 2mm sound proofing(unknown brand) all over the boot floor area and it was still really loud. I added some 4mm silent coat over the top of it and in other areas and it made a massive difference. Cheaper than Dynamat and regarded by most who have used both as as good or better.
It is really heavy stuff though which is its only downside.
My car came with a load of 2mm sound proofing(unknown brand) all over the boot floor area and it was still really loud. I added some 4mm silent coat over the top of it and in other areas and it made a massive difference. Cheaper than Dynamat and regarded by most who have used both as as good or better.
It is really heavy stuff though which is its only downside.
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