Quoting Naz Gassiep:
If you're willing to perform some mods to the case, spraying the inside
with Dynamat Accoustic Absorption spray reduces the noise noticably. If
done well all internal surfaces including the sides of the PSU etc) the
noise drop is dramatic.
http://www.dynamat.com/products_car_audio_dynaspray.html
That is *good* stuff generally, I keep a can right next to my WD40.
How much space does it take up? Like, do I have to be careful about
spraying it so that I can reassemble the case or is it unobtrusive
enough to just spray everywhere?
Thanks,
Peter