Pipe Dreams.....50hz Helmholtz resonator out of PVC pipe. Bass trap or money trap?

[nwickliff]

The nozzle is critical to the design. As I commented earlier somewhere the nozzle is the most important part, more important than the volume because both diameter of the nozzle and the length are parts of the Helmholtz resonator equation, which I also posted earlier.

I measured each resonator to see what frequency it was operating at. If I wanted a lower frequency, I cut a longer neck.