At av123 they have one called x-sub, single driver,slotted and internally folded port, 1" medium density fiberboard, 8" composite cone, 150 watts, 28Hz-120hz,speaker and line level in and out variable phase, crossover,gain 120v-240v switchable price 199./239.
freq response is this something I should be looking at also, so what do you think about that sub???