Reduce edge diffraction to make the best speakers perfect

Hello! I saw the excellent speaker build on youtube, "Building EXCEPTIONAL speakers using MODERN TECHNIQUES" (XEspOD1NHr0), but it had a very clearly audible defect that I would recognize among all: edge diffraction affecting the frequency response.

Edge diffraction is at its worst when the driver is at equal distances from the edges. It is at its best (non-existent) when the enclosure is a sphere.

There are ways to mitigate edge diffraction, but for such a compact build, I anticipate that two halves of cylinder to glue on the sides so that the entire thing has the outside shape of a zeppelin would make the sound immensely better.

Putting that idea out there… to make exceptional speakers close to perfect!