Hi Amir,
I went looking for a video for this fundamental acoustics/speaker concept called directivity.
The first part looks as if it was about what I call the Allison-effect, i.e. increase in power output caused by near room boundaries.
Allison, “The influence of room boundaries on loudspeaker power output”, J. of the Audio Engineering Society 1974, p.314
Allison, “Influence of listening rooms on loudspeaker systems”, Audio Magazine Aug. 1979, p.37
See also
Waterhouse, “Output of a sound source in a reverberation chamber and other reflective environments”, J. of the Acoustical Society of America 1958, vol.30, no.1, p.4
Also talked in there is the interference between multiple drivers.
The ultimate question is how much of that does one hear when playing music? I can imagine that you hear these comb-filter effects nicely when playing noise but what do you hear of these combs when playing a Mahler Symphony? Would'nt that driver interference generate just another comb filter to be added to those already existing (cabinet edge diffraction, first reflections), in which case it would be welcome since it helps to smooth the overall response?
Salomons, “Coloration and binaural decoloration of sound due to reflections”, Dissertation, TU Delft 1995
http://repository.tudelft.nl/assets...7f-8d2a-eb5d6cc04fbf/as_salomons_19951220.PDF
Bilsen, “Binaural modeling of spaciousness and coloration”, Music and Concert Hall Acoustics, Conference Proceedings from MCHA95, Kirishima International Concert Hall, Japan, May 1995, p .327-335, Editor: Y. Ando & D. Noson
This feature of delaying one speaker and lowering volume of the other is interesting, has it been put to the test, i.e. playing music and under blind conditions?
Klaus