First concentration will be...not the shape. Of course it will look like a diamond. but everything will depend on what is behind it.
So, the first research wil be the basis, I mean the sound.
for this I have to consider the lowest and highest frequenz of the Theremin... According to the Thierry Frenkel's new amazing modul, I'll have 32 Hz to 3560 Hz on the output.
question is : is only one speaker sufficient for this...