JBL GT Bass-pro 12 - READ DESCRIPTION - first video - YouTube
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
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Customer Reviews: JBL BassPro 12 Ported powered subwoofer with 12" sub and 150-watt amp at Crutchfield
JBL Bass Pro 12; best auto sound installation; amplified subwoofer 12 inch. Jumping speakers!! - YouTube
Powerful and Detailed JBL GT-BassPro12 Service Manual