555-10320 - Mcm Custom Audio - 15" PA / DJ Speaker, Subwoofer, 700W peak / 350W RMS
12” home theater subwoofer box tuned to 20hz : r/AVexchange
Yamaha NS-SW300 10 250W Powered Subwoofer, 20Hz to 60Hz Frequency Response, Piano Black | Reverb
8 Inch Vehicle Mounted Ultra-thin Subwoofer Stainless Steel Body 20HZ-150Hz 600W | eBay
Hot Selling 150w Subwoofer 20hz Car Modified Audio 8 Inch Ultra Thin Subwoofer - Buy 8 Inch Ultra Thin Subwoofer,150w Ultra Thin Subwoofer,20hz Car Modified Subwoofer Product on Alibaba.com
Studiophile BX10s Subwoofer 240W 20Hz to 50Hz-200Hz/ (No Cables) (sold as is) | eBay
Crown 300W 12" Karaoke Woofer Speaker with Max 8 Ohms Impedance, 20Hz- – JG Superstore