More tetrahedron speakers

Here is some discussion:
https://normanschmidt.net/scores/bachjs-general_bass_rules.pdf
Also an argument of non parallel sides


The KWorld DP0400u D4 2.0 Dark Pyramid Speaker
https://www.amazon.co.uk/KWorld-DP0400u-Dark-Pyramid-Speaker/dp/B004EDWB2Y


The Pleiades linoleum Vicky tetrahedron has a very promising sound as excellent bass and no midrange comes out of the vibrating self damped linoleum triangular pyramid sides. It can also exploit the corner of the room as extension of the bass created horn by the boundaries somewhat like Klipschorn speakers.
The bass horn is created by the vibrating linoleum and wall boundaries.


So far it has not been tried with a one transistor or one electron tube Pleiades power amplifier in class A (electrons flowing all the time).


Other triangular pyramid speakers:


With 2 speakers.


https://www.geargad.com/Audio-Video/Speaker/TBOX-wireless-Bluetooth-hands-free-creative-stereo-pyramid-mini-speaker


https://www.gearbest.com/speakers/pp_67508.html


https://www.canstockphoto.com/3d-red-orange-pyramid-grunge-old-speaker-22967243.html


The Philips type 22AV1993/O1
Speaker is parallel to base sending sound to a 360 degrees reflector


Other tetrahedron speakers by more searching on Google images with keywords triangle pyramid speakers.