I mean, all that deadening is is a sheet that adds mass to the panel (essentially). If you can find another method that works, then by all means. The closest thing I can think of is asphalt roofing felt, which I sometimes use on the insides of my enclosures. Problem is, it doesn't adhere by itself and requires alot for the desired effect. Usually found with the insulation in hardware stores.
And to threadstarter, I apologize if you misunderstood what I was trying to say. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif