Ok I've got a Cinq and have some 5 1/4" speakers in the rear quarter panels.

Now the quarter panels themselves are sound proofed with "Brown Bread", and the area behind the quarter panels are also sound proofed with the same stuff.

What I want to know is what sort of material can I use to put into the enclosure behind the quarter panel to create a sort of air tight box for my speakers, because at the moment there are gaps that go towards the back of the car, as well as gaps that go up the B piller where the drivers Seat Belt is mounted as well as along the sill.

I was planning on stuffing these gaps with some sort of wadding to create an air tight (well as much as possible) enclosure.

Has anybody done this sort of thing before and if so what sort of material did they use, it doesn't matter if it has been done in a different car as the principle is the same.

I heard a rumour that loft insulation is a good bet but my dad seems to think this would be any good as it isn't dense enough to contain the sound in the enclosure.

PLEASE help me out.

Thanks very much

Brian

how big the gap, could you use silicone sealer or spray expander foam, seen some guys line thier boots with foofing felt type stuff but not to sure what you are talking about, could you post some pics?

Yeah sure I'll post some pictures up tomorrow (opps I mean today, doesn't time fly when ur messing about on the web looking at pointless stuff).

I'll also post a picture of the sort of thing I'm looking at doing as you know what they say a pictures is worth a 1000 words so hopefully that will get across what I am trying to say.

Ok I've now been outside and taken some pics of my car in its current state.

These are as follows.







This is what I intend to do, but would like some advice before going ahead and doing it.


In this picture the red indicates where I am going to spray a small amount of expanding foam to seal the gap. This gap can't be filled with sound proofing as it is just too small for my fingers to get into.
The Green indicates where I was intending to stuff some wadding type material to create an enclosure this can be seen better in the next picture, see below:


Here the green represents the wadding I was intending to put into the enclosre, taking careful account of the passenger seatbelt, as wadding will have to be kept away from this to stop it jamming.

Please get back to me and say what you think about the expanding foam as well as the wadding idea.

I look forward to hearing from you.

Brian

u can buy a material called king span, it comes in 8x4 sheets, that could work cause its very rigid almost like a board and it comes in various thicknesses, its like ploystrene covered in a silver metalic stuff, u would need to wear gloves to cut it, as it some times causes a rash

loft insulation wouldnt be a bad idea, its cheap and cheerfual and with enough off it u can really pack it in there

i would lay off the expanding foam though as it could seap though the smallest off gaps and could ruin something

I dont think the expanding foam will be to bad. from what ive heard its quite dry and expands almost instantly when you use. either that or use layers of foam like u get in normall floorstanding speakers.

From the pictures looks like youve done a gud job so far. i did my front doors with brownbread and it takes alot of time and patience to get it right.

Do u find that with sound deadening in the back it filters out noise from bacbox (guessin u got an after market backbox) im all for loud exhaust but find mines bit to loud inside car

anyways keep us updated m8. tiss lookin gud so far

adam

I wasn't planning on filling the area behind the quarter panel with expanding foam just the small gap between the curved part of the arch and the exterior bodywork, (The small area marked in red in the 4th pic down). Because as can been seen in the 2nd pic down there is a small gap between the two sheets of metal that I just can't fill, so I thought expanding foam would solve this problem.

'Gaz' the material you are talking about "king span", doesn't really sound like what I am after, I'm really looking for some stuff like they fill pillows with (well that sort of material anyway, a bit like cotton wool etc, as against board type material).

I can't remember who it was but someone suguested using loft insulation, can you get a materail similar to loft insulation but stops sound from travelling?

I hope someone can help me out.

Brian

I think the loft insulation may be a bad idea, firstly because it can leave a big mess, and secondly, the heat would be unbearable in the summer if you leave the car parked.

That's my thought anyway

IF you do not mind the heat (as brickfoot mentioned), then use loat insulation, I think this will be the best idea, I have seen it been done and it does work. It is very cheap, relatively light and you can cover it with clingfilm type this (obviously not acutal clingflim) or some kind of cover to stop it causing a mess befroe you put it in.

For the small gaps where sound deadener is too think to put in, for my punto I used a small can of spray foam. Does the job brilliantly and drys quite quickly without a mess (if u can do it!). I highly recommend practise with this. As it is fun and also can be quite amusing if you don't expect it, practise just on a peice of wood ro sumthing.

Thanks very much for your help everyone.

I'll keep you all updated with my progress.

If anyone else has any views on this subject I'd REALLY like to hear them.

Thanks for everyones help.

Brian

wadding is quite cheap, a bit denser than loft insulation

i would recommend ripping up a sofa and having a look if that is suitable

Funnily enough I've not got a spare sofa to hand.

Do you know where I am likely get somewadding from? What type of shop/store are likely to sell it and is it expensive?

Any further information on this topic would be very helpful.

Brian

this link is for wadding for a sub, i would imagine that it is the same

https://www.shopcreator.com/mall/productpage.cfm?store=AutoAcoustics2&productid=WAD-1&did=32272

most diy stores would sell something similer, or furniture places, if u got a skip near u, u could try nicking the stuff out the sofas that they bound to have there

The market at chester is usually a good place to star and it's cheap. I got some foam there ages ago to replace the internal sound deadning in the floorpan of my old panda.

A decent block of foam padding should do the trick and can be cut easily to shape with a sharp stanley-knife

Hope that helps

I would just go to a B & Q warehouse, cheap as chips and they have everything you could want. That is also where I got my spray foam from that worked a treat.

Thanks a lot people, there's an upulstry shop in the "Galleries" in Washington right next to where I work, so I think I might try in there to see if there's anything that's suitable.

If not I'll have a trip to B&Q and see what they have.

Thanks for the help I'll post pictures up when I've done more.

Brian

Oh yeah I almost forgot;

"Tidyboy" yeah I do have an aftermarket backbox (a modified Magnex one), I've also got a Supersprint De-cat pipe and a Supersprint 4-2-1 Stainless manifold so the exhaust note its pretty loud, but the sound proofing really helps quieten it down inside the car.

Hope that answers your question?

Brian

hehe i was a bit worried u had forgoten me.

cheers for the response though i am really considering doing it as the sound of my backbox interferes with the bass from my sub alot

Ok today after speaking to my dad, (who has been away in America on holiday), he recommended like "Clayton" that I should you some spray expanding foam, so off to B & Q I popped.

Having looked at all the loft insulation and talked to one of the chaps there, they said that loft insulation wasn't really what I was after as its designed to contain heat and wouldn't really do anything to contain the sound of speakers, so I headed for the spray expanding foam.

I picked up some Unibond spray expanding foam, for about £5 (which may sound quite expensive, but its what I needed), I'll be doing some spraying tomorrow so will take some pictures once the foam has harderned.

I'll keep you posted

Brian

Nice one brian mate, just do what I said first though, just give a little squirt nowhere near your car for a 5 second practice.
You will thank me. and hopefully leave me some good rep!!!