stratum wrote:Just curious, is an omni-point source actually possible in practice?

Omni-directional point-source in acoustics is basically the same thing as a "point light" in computer graphics and it's certainly not a physically plausible model of anything (eg. if you tried to solve for the required energy at the point source, you'd run into a singularity). Rather it's just a simplification that makes the mathematics a lot easier to deal with, based on the assumption that if the source is reasonably small (ie. "looks close enough to a point from a distance") and reasonably omni-directional (although adding directionally dependent attenuation factor is not exactly complicated) then hopefully the error introduced isn't too big of a deal.