Posted for JIMRHER@aol.com:
I have been flying my L4P with this EAR material. We even put it down the sides a bit and under the carpeting up front. I just want to point out that most of the time I don't take my Bose X headsets off but on my last flight I had to remove them to hang my OXY mask around my neck because I decided to go to FL 250 after I took off. I can't believe how Loud it is when you consider I have a 4 bladed prop and full upholstery. My conclusions are that the windows and the door gap, inches from your ear, are far more important than the insulation, even though I think the engine would be much louder if I didn't have the EAR material installed. One other thing is my hearing. I'm 62 and have 9 band digital hearing aids which work very well. In the past I would take them out with my first generation Bose in my Bonanza because of ear sweating but these new Bose X are the most confortable and work outstanding, allowing me to keep them in. So when I remove the headset I have super hearing and some frequencies are too loud. So please qualify my judgement on sound levels.
I also flew in a Turbine L4PT for 1.5 hrs with no upholstery and it sounded about the same loudness but different.
Also, I read a review of the new Raython Premier which has a Carbon Fuselage and they said that the back cabin was UNACEPTABLE from a sound stand point. It has a wall thickness of .875 in. and they though it was the drum effect of the high modules carbon fiber.

Good Luck, see you at OSH,
Jim Hergert
N6XE, "An Sex Y" L4P

Copied from Hal's email:
(((Mike Custard, who builds Lancairs in Bend, has found a material that he says
is a good substitute for the heavier kit.  The material is made by EAR in
Indianapolis (the same people that make the Conforfoam) and is called
ADC.152.