In my experience and experiments, active acoustical controls are very impactful....Most people think about passive materials, absorbing or reflecting sound waves....
But active way are very powerful for modifying the acoustic dimension: Helmholtz bottles, Schumann generators, resonators of different size and materials from bucket to tiny resonators.... I use them and vouch for that....
But active way are very powerful for modifying the acoustic dimension: Helmholtz bottles, Schumann generators, resonators of different size and materials from bucket to tiny resonators.... I use them and vouch for that....