Amazon.com: Bluetooth Speaker, 40W (60W Peak) Portable Wireless Speaker with Colorful Lights, Double Subwoofer Heavy Bass, FM Radio, MP3 Player, Bluetooth 5.0, Loud Stereo Speaker for Home Outdoor Party Camping : Electronics
1PC 4 Inch Hi-Fi 8ohm / 4ohm Subwoofer Speaker Audio Super Bass Woofer Loudspeaker 40W High Power Speakers (Size : 4ohm)
Ghxamp 5 Inch 4ohm Woofer Subwoofer Hifi Speaker Low Frequency Fever Woofer 40w 45hz-5khz For 2.1 Audio Subwoofer Diy - Speakers - AliExpress
Ghxamp 1pc 4 Inch 40w Subwoofer Speaker Woofer High Power Long Stroke Bass Home Theater For 2.1 Subwoofer Unit Loudspeakers Diy - Speakers - AliExpress