Epique E150HE-44 5-1/2" DVC MMAG Extended Range Subwoofer 4 Ohm per Coil
Amazon.com: 4 Inch Woofer Mid Range Speaker 40W 4Ohm Subwoofer Car Audio Mid Bass Long Stroke Loudspeaker Low Frequency Home Theater DIY (Size : 1 Piece) : Everything Else
GoldenEar ForceField 40 10" compact powered subwoofer with digital signal processing at Crutchfield
B1240 subwoofer enclosure 12"/30cm 40 liters
Amazon.com: 2PCS 40W 4Ohm 8Ohm Woofers Speakers 4 Inch HiFi Deep Bass Subwoofer Speaker 4 Layer Voice Coil Loudspeaker Car Subwoofer DIY (Color : 8Ohm) : Everything Else
GoldenEar ForceField 40 10" compact powered subwoofer with digital signal processing at Crutchfield
40 Inch Subwoofer For Premium Entertainment - Alibaba.com
BOSS Audio Systems P129DC Phantom Series 12 Inch Car Audio Subwoofer - 2600 Watts Max, Dual 4 Ohm Voice Coil, Sold Individually, Hook Up To Amplifier
DS18 ELITE 3.5" Full-Range Speakers with Bullet and Glass Fiber Cone 120 Watts 4-Ohms car audio stereo speakers
1x 4.5" in 4Ohm 40W Super Bass Driver Audio Speaker Stereo Subwoofer Loudspeaker | eBay
SPK-12S4 - AudioControl
Audint push sound limits with 40-inch infra sub
4Ω 4" Inch 40-100W Subwoofer Woofer High Power Long Stroke Speaker Loudspeaker | eBay