The Pyramid is a loudspeaker designed for minimum housing resonance and reduced internal standing waves.
Its distinctive shape is a result of a pyramid design:
Very stiff housing (from thick MDF needing no bracing)
No internal wadding
Pyramid design prevents standing waves as there are no parallel sides
Sealed enclosure infinite baffle design for smooth unexaggerated bass response.
Soft dome tweeter for natural sounding treble and stiff fibre-glass mid/bass
Also the crossovers are mounted externally near the amplifier so that they are effectively bi-wired and no acoustic
feedback can get to the crossover components.