I completely agree with Fons' point about wavelength and its relationship to objects within the room. But, I've also seen this mirror trick, "image method", in audio literature, for instance: http://www.sgm-audio.com/research/rir/rir.html See note [1] https://www.cs.princeton.edu/courses/archive/fall00/cs426/lectures/acoustics/acoustics.pdf I think I also saw it in Philip Newell's studio design book. To Fons' point, none of what I've ever seen on this topic ever included room contents, and this has always been presented as an _efficient_ approximation. For that efficiency some accuracy has to be left out. My sense is that this might have some usefulness, but not be the final word on the subject. Cheerio... -- Kevin _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user