Answer:
Yes, if the sources of the sound were on the same plane as the observer.
Problems, in physics often require the variations of sound at some distance from a pair of speakers - note that the speakers are on the same plane as the observer.
A diffraction grating usually consists of extended vertical slits which would not be conducive to an observer receiving sound from these slits because of the variation of distance from the observer to a single slit because of the vertical height of the slit. There would also be the problem of a single slit producing a wave of uniform phase across the height of the slit.