"ziz" wrote in message
...
I have a Volvo S80 saloon with an excellent sound system. I listen to a lot
of music in the car and would like to soundproof the car.
Can anyone offer advice on:
Where to buy materials.
How to go about it.
I am happy to spend the time doing it well if I can get some detailed
advice.

I'd expect it to be a waste of time in something like an S80. I'm assuming
you're trying to keep out external noise rather than stop the noise getting
out...