profdant: what I'm looking to purchase helps locate and isolates the area where a noise originates so that one can find a problem and hopefully make the necessary repair. The chassis ear does not regulate noise.No I don't have a repair shop but I once was trying to find a very irritating loud whistling noise in my rv that would appear at 55mph and disappear at around 70mph. Chased it for over two years and was ready to sell it cause it was so annoying. Turns out the noise was coming from the drain line in the galley sink which had an empty trap and the vent line for it was making the noise like you'd get when you blow across an empty soda bottle. With the chassis ear I could have found the problem after only a couple of attempts.