Sound waves from a conical loudspeaker spread nearly uniformly in all directions if the wavelength of the sound is much larger than the diameter of the loudspeaker.
Sound is essentially transmitted in the forward direction if the wavelength is much shorter than the diameter of the speaker.
Q. What is the explanation behind this phenomenon and why the diameter is significant for the direction of propagation of wave?
This seems to be a result of diffraction. Diffraction: the bending of waves around small* obstacles and the spreading out of waves beyond small openings.(*small compared to the wavelength)
Q.But where does the bending occur?
Q.And what is the obstacle here?
I guess that bending occurs at the edges of loudspeaker
Q.What does the bending has to do with the loudspeaker's diameter?
If I hold my previous assumption correct,the thickness of edges should only matter and should be responsible for diffraction.