How to create a triangular pyramid for a monitoring speaker

At your risk. Take all safety precautions.


For example using linoleum as the pyramid material and a fullrange speaker.
See also linoleum Pleiades speakers.


Vicky gave the idea of making a triangle base pyramid as a speaker enclosure.
A tetrahedron pyramid must be a great idea since it only needs 3 sides to be joined if created from a net, see Wikipedia on tetrahedron.


A tetrahedron example.


Using a 5in speaker.


A 14in radius circle should be adequate, drawn on a nice colored linoleum sheet. For example Tarkett Etrusco series.


Then the compass radius is reduced until the circle circumference can be divided to 3 equal parts.


The 3 points then define an equilateral triangle.


The triangle is drawn.


Then the half points on each side are found using the well known compass method of finding the half of a line segment.


3 more points are defined.


The smaller triangle is drawn.


Linoleum is cut on the long sides and just somewhat deeply engraved on the smaller ones.


The centre triangle can be the face of the speaker. Which is convenient for 2 reasons:
1 centre already exists from part 1
2 it is the strongest triangle as its sides are not cut, just bent.


Having said the above. Asymetriy ie not very accurate production may be better for sound.







Method 2.
A great nice and strong equilateral triple is created with small holes at the points defining the triagle. Just a ruler and a compass is needed. See next post.


These points are engraved on linoleum by a compass etc. Then the triple is rotated like a cat keeping these 2 points. Similarly repeated for 3 more triangles around the central one.


Pyramid is ready by just bending the sides of the inner equilateral triangle.




Such tetrahedron pyramids should be much easier to make for a linoleum Pleiades monitoring speaker than a cube Auratone 5C type shape. How would they sound?


Perhaps it is best if 3 drive units are available to do the following test:


Carefully hanging the first drive unit on its own.


Then a speaker with the whole triagle shape as a baffle.


Then a drive unit inside the pyramid.