Glass of all thicknesses could have this resonance frequency, so It doesn't matter how thick you go, there will always be a frequency at which the glass will actually make noise louder. This is the motive why acoustic window programs will employ glass of two different thicknesses – to combat https://stainless-steel-slanted-t33210.blue-blogs.com/33023741/a-review-of-quiet-4sash-windows