Geometry in audio.

Can't get anymore pyramid shaped than this: http://www.acoustic-reality.com/tetrasite1.htm

Design Acoustics' D-12 was always one of my favorite designs. A dodecahedron speaker (in theory, it was supposed to mimic a pulsating sphere) from the early seventies. It had a 10" downward firing woofer, a 5" upward firing midrange, and nine tweeters on all but one of the remaining faces (which contained the woofer port).

I have not been able to locate a photo of one yet, but do a Google search for dodecahedron speaker. There are other companies using this design.

Also look into "golden ratio", which is something like 0.619. Fold it in half, and you get it again. Play poker? That card is a golden ratio. It's also found in ancient architecture like the Parthenon.

There are suggestions that it is the perfect shape for a listening room. Something about minimal reflections or standing waves.

jh

Avolon Eidolon and Radian (sp?) speakers are all kinds of trapezoidal shapes. Reference Da Capo monitors are trapezoids too--or maybe they are rhombi? [can't really remember what a rhombus is] How about Thor amps, which I think are circular? Some models of Gallo speakers are spheres. Bass traps are tall cylinders. The Ringmat is a circle. And look at all the vibration-contolling "cones" around.

I think Nagra makes a pyramid-shaped DAC.

edge has pyramid shaped monoblocks.

Yamaha had an amp back in the 80s I think that was shaped like a square base pyramid.