Amazon.com: 5 CORE 4 inch Woofer Driver 40W 4Ohm Replacement Full Range Speaker Audio Stereo Dual Cone Concept for Extra Crisp Sound Made in India - Pair : Electronics
4 Inch 105mm Speaker Subwoofer Speaker Bass High Power 4ohm 40w Long Stroke Computer Car Home Theater Loudspeaker 2pcs - Speakers - AliExpress