JBL Bass Pro 12 vs. Stock Bose System: Decibel Measured! - YouTube
Amazon.com: JBL SUBBP12AM - 12” amplified 12” Subwoofer with Sub Level Control, Black : Electronics
JBL GT-BassPro12 Ported powered subwoofer with 12" sub and 150-watt amp at Crutchfield
Amazon.com: JBL GT-BassPro12 12-Inch (300mm) Car Audio Powered Subwoofer System, black : Electronics
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 GT-BassPro12 Ported powered subwoofer with 12" sub and 150-watt amp GTBASSPRO12