Czar has a good idea.
I built my own based on a German industrial unit from ElmaSonic. The 80KHz setting is best. But it does radiate a lot of US noise, which most people cannot hear. Nothing against my 16.5, but the US is FAR better.
I built my own based on a German industrial unit from ElmaSonic. The 80KHz setting is best. But it does radiate a lot of US noise, which most people cannot hear. Nothing against my 16.5, but the US is FAR better.