How does the Audi A6's acoustic glass provide optimal noise reduction?

I've heard the Audi A6 has great noise reduction, but how does it actually work? Can I expect it to completely block out external noise?

The Audi A6's acoustic glass is specifically designed to block out outside noise and provide a quiet driving experience. While it may not completely eliminate all noise, it significantly reduces it.

Acoustic glass is made up of two layers of glass with a thin layer of PVB (polyvinyl butyral) in between. This combination creates a soundproof barrier that blocks out high frequency noise.