An acoustic windshield is a windshield that absorbs the sound from the out side and does not allow it to effect the sound in the inside, while the inner portion of the windshield takes the vibrations from the music your playing and bounces it back to you with a nicer quality to it, almost like a filter. Usually the sound that was absorbed from the out side creates a filtration system in the inner core of the windshield.
you made up something that came true.....
Our Cadillac STS Premium package has a dual layer windshield to reduce wind and engine noise. It is big bucks when it gets a rock chip and needs to be replaced.
im an auto glass installer ...acoustic windshields are normally made for gm and acura vehicles from what iv seen ..14 years exp. the only upgrade they make for are cars are the polorized windshields wich are better because they do have the affects of the acoustic but also keep your car cooler and keeps the glare out when driving against the sun ...here are some pictures of mine i installed...ppg glass actually made a limited amount of these windshields for the lx platform in canada ..i just happen to find one