JBL Stage 810 8" Car Audio Subwoofer - Walmart.com
For Jbl Boombox2 High-end 4 Inch 106mm Mid Bass Speaker Subwoofer 4ohm 40w Woofer Low Frequency Long Stroke 1pc - Speakers - AliExpress
Amazon.com: JBL Club WS1200 12" Shallow Mount subwoofer w/SSI (Selectable Smart Impedance) Switch from 2 to 4 ohm Bundled with Alphasonik Earbuds : Electronics
JBL 5048239X 2279H 18-Inch Replacement Woofer for SRX828S | PSSL ProSound and Stage Lighting
JBL Stage 122D Stage Series 12" component subwoofer with dual 4-ohm voice coils at Crutchfield