my whole dash is covered with open cell foam and a carpet dash pad....took care of a ton of reflections....
my underdash....i took out the factory panels....got some wire "mesh" that has about...1/2" by 1/2" squares in it....put egg crate foam on the top facing down toward the floor of the car....put open cell foam on the bottom of it....got out the needle and thread...sewed the two layers together onto the mesh....covered the bottom with carpet and installed back in the factory positions....
the need for eq'ing from 1k on up disappeared.....
my underdash....i took out the factory panels....got some wire "mesh" that has about...1/2" by 1/2" squares in it....put egg crate foam on the top facing down toward the floor of the car....put open cell foam on the bottom of it....got out the needle and thread...sewed the two layers together onto the mesh....covered the bottom with carpet and installed back in the factory positions....
the need for eq'ing from 1k on up disappeared.....