Dual JBL Club 1024 Subwoofer in L-Ported Box BASS TEST - YouTube
Stage 122
JBL Stage 82AM Stage Series 8" 4-ohm component subwoofer at Crutchfield
Amazon.com: JBL BassPro SL2 Active Underseat Car Subwoofer with Built in Amplifier - Under Seat 8'' Subwoofer Car with 125 Watt Power Amplifier : Electronics