Hi that's some really good info there, especially the part about sticking it down well as I originally intended to just use carpet tape, but I'll have to use some proper spray adhesive now.
I'm still stuck for a real sound deadening product. I've been looking and have come across this:
Car Sound Proofing Deadening Jute Felt Soundproofing.4 meter x 1.37 wide £42.00 | eBay
It seems to cover most of the basis, rubber then felt and carpet?
And isn't that expensive?
Also just found this:
Silent Coat Noise Isolator 8 Bulk Car Sound Proofing | eBay
Does either of those look okay?
Thanks
To be honest its not really worth spending an absolute fortune on sound proofing cos its still gonna be a noisy motherf*cker. I managed to acquire the acoustic matting that Exmoor trim makes (the expensive moulded rubber stuff) and in my opinion it doesn't make a great deal of difference and even if I had the cash sitting spare I wouldn't pay 400 quid for it.
What would be good though, whilst we're on the subject and my apologies for hijacking the thread a little, but what's peoples best ideas for soundproofing from engine noise? I would do a search but I'm on my phone and it won't let me :s
Sent from my electronic brick
It's not a cheap solution by any means but it is the correct way to maximise the acoustic dampening. Just resting the rubber matting on top will dampen some of the vibrations but not all.
What you're looking to do is transfer the energy from the vibrating surface into the rubber matting as it is more compliant and will take the energy out of the vibrations. The best way to do this is to firmly glue it down otherwise you'll break the larger panel into smaller areas
There's a mathematical relationship between the size of the area, the flexibility of the material and the frequency radiated.
Take a large area and break it down into smaller areas and you raise the pitch of the sound being transmitted. A very similar thing happens when you move your finger up and down a guitar string
So you might help tame some of the lower exhaust notes but some of the mid range will get through and the more those frequencies venture into the 1Khz to 4Khz range the more sensitive our hearing becomes and the harder it is to understand the person talking next to us
Also by removing some frequencies your awareness of what is left will be increased
By gluing the mats down properly you really do dampen the entire panel
By then adding a layer of felt (and yes
maxw I'd go for the Jute felt as it will mold to the contours better) and you further dampen the sound
As I said the trick is a multi-layer, multi-density approach. There's no product out there that will do the job on it's own but if you're on a budget density is your friend and that roof flashing stuff can also work wonders
Lastly I cannot stress the importance of sealing holes enough
A joke for Landy owners I know but it's no coincidence that modern cars have double seals on the doors it really does make a massive difference to road noise
If there's a hole, sound will get through it no matter how small it is