That's why these questions keep coming to my desk (remember I'm an incurable generalist in the façades world): what effect does glass thickness have in the acoustics of a double glass unit?
Or what matters more in the acoustical performance of insulated glass: the thickness in a monolithic pane, the effect of lamination or the dimension of the cavity?
Any particular sound or noise can be represented as a number of 8 (or 24) sound pressure levels in the frequency bands, as illustrated by the diagram below.
A real sound shown as a combination of different sound presure levels, one per each of the 24 frequency bands. Column height: SLP at each frecuency band, measured in d B.
So SPL is what matters to us, poor construction buddies.
For ease of numbering SPL is measured in decibels (d B).
Here you will find some graphical answers to these questions.