Amazon.com: MTX TN10-04 10-Inch Single 4-OHM Subwoofer 150-Watt RMS Black : Electronics
Monoprice 12in 150-Watt Powered Subwoofer, Black - Monoprice.com
150w High-power Subwoofer Speaker 8 Inch Home Theater Hifi Fever Speaker Super Subwoofer Speaker High Fidelity Long Stroke Bass - Speakers - AliExpress