That Fs is promising. The Qms of 3 + the Mms is sort of surprising to me for a budget sub, I guess. Seems beefier. Mms directly lowers resonance, like if you were to add some glued on weights to the cone or something. If that weight is in the coil, that's good news, because that's power handling. You stuff a bunch of these in a proper ported or series 6th, it could bang. Enough of these cheap woofers will do stuff I think people wouldn't expect. Anyways, seems to me like the woofer is actually designed decently, not just like sharted together, at least if the t/s are true.