Been keeping an eye out at this web page www.rythmikaudio.com Using any sealed or ported box; by installing the special servo equipped woofer (30.5mm excursion) with the mating 350watt plate amp one is suppose to get 108db @20 hz with a sealed box guaranteed. Apparently, the real benefit is no math involved...no need to calculate port size, cabinet configurations, thiel parameters, stuffing, etc. just plug and chug. Too good to be true? Anyone used this with success. The kit price is fairly reasonable.