There are many car audio woofers with low Fs, high Qts and large Xmax ratings that would seem to be tailor made to EQ at the bottom. And given their 4 ohm impedance, they’d be simple to wire in series for an 8 ohm load.I know one has to buy Car audio generally-i notice many kicker brand subs have super high Qts
the dayton 15" IB woofer comes to mind, 109$ on special lastweek i saw......
i like high SPL though,like 115db at listening position,so IB doesnt appeal to me at the moment.but if i have my horn subs for high output,i would like to try this dipole idea
Smaller box too!
:-)