Interior noise

[sheldonm <Sheldonm@mind.net>]

I am interested in what measures people have taken for cabin noise in their
Europas. I have flown Kim Prouts plane which has no damping and have found
it louder thatn many spam cans. He has measured it at 93dbA. I understand
that ELSA is quieter. It apparently has a pad over the firewall.
IT seems that the main sources would be firewall, Gear tunnel, Fuselage
vibration and windows.
What measures have other builders taken?
Anybody have measurements on their planes ?

thanks
Sheldon