センターバレーJBL S2-1224 12” SSI(TM) Subwoofer and enclosure switch Smart Black to Impedance) (S2-1224SS) from ohm, with (Selectable スピーカー | grupouniversal.com
JBL - Two CLUB1224AM Club Series 12" Subwoofers with SSi Selectable Impedance - 2 or 4 Ohm - Creative Audio