MemberJune 2, 2021 at 8:38 pm
Thanks Nick, I heard that too. I think it has to do with the fact that the blades have to be rotate to create the positive and low pressure for the needed frequencies, and that the wider the blades sweep outwards (to a certain point) the louder the sound, since the spin of the blade system would be more difficult to control I assume. If the blades sweep out further (for more volume) then it means there is further for the blade to turn for that shift in pressure. I think this means that the quieter it operates the higher in frequency it can go (apart from over limiting factors such as accuracy of course). This is just what I believe to be true from 1st year fluid dynamics in engineering so I might be wrong, but I think that’s all I know about rotary subs.
The amplifier part is an interesting factor, maybe a bass shaker amplifier would be well suited?
Another thought that occured to me is, would it need some sort of enclosure/separation between the front wave and back wave? I would have though so.