JBL Club 1224 Club Series 12" component subwoofer with switchable 2- or 4-ohm impedance at Crutchfield
JBL SRX918S Single 18-Inch Powered Subwoofer - Sound Productions
JBL SUBBP12AM Ported Powered Subwoofer w/ 12" Sub and 150-Watt Amp
Amazon.com: JBL SUBBP12AM - 450 Watts (150W RMS) 12” Amplified 12 in. Ported Subwoofer with Sub Level Control and Distortion Free Bass with Gravity Magnet Phone Holder Bundle : Electronics
JBL-EON718S | JBL Professional Loudspeakers
JBL CLUB1224AM Club Series 12 Inch Subwoofer with SSi Selectable Impedance - 2 or 4 Ohm - Creative Audio