Box for bass guitar speakers (Jerihon tube :)

grabcad

In 1974 I built a custom box for our unit's bass guitar speakers in the Soviet army, designed specifically to improve sound quality. We used two "25A-13" loudspeakers from a "Ukraine-4" movie projector kit, which measured 12 inches in diameter. This idea was actually conceived by one of my fellow musicians, and we thought it made a noticeable difference, but it's possible our perception was skewed. I fabricated the box using readily available materials: 16 mm chipboard and 3 mm plywood. The shape of the bell is entirely arbitrary, dictated solely by the dimensions of the materials at hand.