(Later addition: The linoleum triagle pyramid speaker may have a less flat frequency response than the linoleum cube Auratone 5C type speaker. More experiments needed.)
It is made as described on previous post.
Date time code is 19072114. While engraving this Vicky kindly brought the first prototype she built. Kindly stating it is a Pleiades invention.
This is incomplete. Pleiades contributed to the use of linoleum for its elastomer property and lack of ugly wooden reasonance of conventional speakers. Vicky came up with the tetrahedron (triagle pyramid) shape after suggestion from Michalis to examine horn loaded Lowther cabinet designs. The Triagular pyramid gives amazing non parallel wall performance making the sides of the speaker only radiate at bass frequencies of good quality and not at middle frequencies as well as in the case of a cube. The triagular pyramid also can uses the walls as extension of a horn, much like the Klipshorn speaker. Horn throat is defined by the vibrating linoleum thin material and the boundary of the walls. This arangment gives projection of bass in a larger room from a relatively small pyramid speaker. If Vicky did not think of it Pleiades would possibly never had come up with a triagular pyramid shape. Square base linoleum pyramids had been built at Pleiades from linoleum for bass absorption inspired by photos of EMI Columbia Athens studio 3 (wooden?) phew minds for diffusion and possibly bass absorption. The triagular pyramid shape is very suitable for a speaker. Very rigid too.
Linoleum objects absorb bass by sympathetic vibration thereby converting difficult to absorb bass sound to heat. So a soaker as such an object will not only radiate music of good sound quality but also reduce the reverberation. Time at bass frequencies of a room improving acoustics clarity.
First prototype is made of red Tarkett linoleum.
Second prototype is being made with apple green Tarkett linoleum.
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