Hey Guys, Been a while since my last visit, as ive been away for a well earnt break.. But recently i've been set a challenge and its baffling me some what, and i wonder if anyone can help pleaseeee Basically long and short of it, a Car Manufacturer has been struggling in enhance the "Feel & Experience" of driving there cars, customers have mentioned they'd like more sound and acoustic feeling when accelerating. Now i've been asked to design a conceptual to that enhances the sound characteristics of the engine, NOT USING the exhaust... and NOT USING ARTIFICIAL EQUIPMENT..(Basically Aston Martin and a few other manufacturers actually use small microphones placed in the engine bay and after a certain rev band is accessed, play those noises under the dashboard to enhance the drivers experience.. So am thinking of making some sort of cover for the engine to manipulate and channel the sound of the engines tones towards the cabin.. Anybody know of any materials thats properties would assist me? Or any technology you may suggest i look into to help me as am relatively stumped... Thanks T.