Subwoofer response very quiet at 31 Hz with loud peak at 27Hz
Hi, i made an isobaric subwoofer with 72L Box from 18mm plywood, two GRS 10SW-4HE 10" and port tuned at 20Hz, which look very flat, and went very low in WinISD. I made the port from pvc pipe and 3D printed flange. Unfortunately response is not very flat, with response a little lower and lower from high bass down to ~34Hz and then deep diving to 31Hz where it barely makes any sound and then goes super lod at 27 Hz and goes quiet back at 24Hz and silent at 22Hz. What could be culprit?
