JBL SUBBP12 BassPro 12 Subwoofer System with Slipstream Port Technology - Walmart.com
S2-1224SS | 12" Slipstream™ ported enclosure
Amazon.com: JBL BassPro SL2 Active Underseat Car Subwoofer with Built in Amplifier - Under Seat 8'' Subwoofer Car with 125 Watt Power Amplifier : Electronics
JBL BASSPRO 8" Single-Voice-Coil Loaded Subwoofer Enclosure with Integrated Amp Black SUBBPSL2AM - Best Buy
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