Originally Posted by Glenn Kuras
Ethan I generally test a room with product and without, but what is the calculation you use after you test?
Testing with REW is great to get a visualization of the change, but it doesn't give actual absorption in sabins. This formula is from the Decibels Excel spreadsheet that comes with my book:
Cell B46 is where you enter the dB difference between the SPL levels at the microphone with and without the absorber against the wall.