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Originally Posted by DanDan  Real situations have large areas of floor, interacting with the room. IMHO a little patch will not represent this. |
I agree when the entire structure is being considered, but from the perspective of surface reflectivity only, which is all I've ever addressed in this thread, testing a little patch is valid as explained in my post above this one.
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Samples for ISO standard tests are 10 square metres at least.
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Unless they're tested in an impedance tube, in which case a 2 by 2-foot patch is typical. My proposed test is exactly like an impedance tube, except it wouldn't have been sealed because I would have considered mid and high frequencies mostly.
--Ethan