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Old 14th October 2019
Lives for gear

And adding to what dinococcus said: Schroeder is not really a "cut off" at all! At best, it's the spot in the middle of a range of frequencies, maybe a couple of octaves wide. Its not that everything above Schroeder is wonderfully smooth modal response all the way up to heaven, and everything below that is terribly bad major modal resonance all the way down to hell! The Schroeder frequency is a theoretical calculation based on several assumptions that may or may not be true. It serves as a guide to roughly where things transition from one type of acoustic response to another, but it's a broad transition, not sharp... and that's about it! In a typical small room, that's about all it can tell you...

But to answer your question: You probably can't calculate it from REW, but you can often see the effects in the REW graphs. Well below Schroeder, you see the huge ugly peaks and dips of bad modal stuff, with well defined sharp resonant tails, and wildly different decay times. Well above Schroeder, things look a lot smoother, with only minor peaks / dips, and more even decay times. Once again, it's interesting to look at, where you can sort of estimate "Shcroeder must be around the middle of that transition region in my room, say roughly XYZ Hz."... but that's about it. Its not much use beyond that. The treatment you put in your room won't be change much, of your Schroeder frequency happens to be 50 Hz higher or lower.

Useful in theory for acousticians... but not so much in practice for the average home studio builder.

- Stuart -