Ghxamp 1pc 4 Inch 40w Subwoofer Speaker Woofer High Power Long Stroke Bass Home Theater For 2.1 Subwoofer Unit Loudspeakers Diy - Speakers - AliExpress
Source 40 Watt RMS deep Bass BT 2.1 CH Computer Home Subwoofer Speaker with Remote on m.alibaba.com
DE525-01 Woofer 5.25" 4Ohms 50 Watts (2 Pcs)
SUBWOOFER 4 Inch / Hi End DIY / 4 ohm 40 watt - YouTube
Massive Audio MX Series 4-Inch 40-Watt-RMS 2-Way Coaxial Speakers in the Mobile Audio department at Lowes.com
Polk Audio DB1242SVC 12” 1110 Watt Single 4-Ohm Car Audio Subwoofer Sub+Speaker | Audio Savings
Amazon.com: 5 CORE 4 inch Speaker Driver 40W 4Ohm Replacement Full Range Audio Stereo Dual Cone Concept for Extra Crisp Sound Made in India (Pair) : Electronics
Current Audio SB65 40 Watt Amplified Soundbar & Wireless Subwoofer Electronics - Zavvi US
Goldwood OEM 15 in. Woofer 300-Watt 8 ohm Replacement Speaker GW-215/40/8 - The Home Depot
Pioneer 12 Inch 1400 Watt Subwoofer Car Audio Power 4-Ohm SVC Sub | TS-W311S4 - Walmart.com