This is a Chinese 10" HT subwoofer. I pulled the driver out, measured a Fs of 48Hz and Qts of 1.1, which explains why the ported box has an "M" shape under 80Hz (measured in room, 3m distance).
This is the "after" measurement, with the cabinet tweaked (an extra skin added, to double wall thickness, plus improved stuffing and bracing)
Seems so obvious now, why most sub + satellite systems sound as boomy as they do.
This is the "after" measurement, with the cabinet tweaked (an extra skin added, to double wall thickness, plus improved stuffing and bracing)
Seems so obvious now, why most sub + satellite systems sound as boomy as they do.