Digger8 Sub - diggity dig it all the way to 20Hz - Techtalk Speaker Building, Audio, Video Discussion Forum
Canton Sub 650 Hi-Fi subwoofer Brown 350 W 20 Hz - 200 Hz | Conrad.com
Grimm Audio Announces New SB1 Digital Motional Feedback Subwoofer | audioXpress
Acoustech Elite Series PL-300 – 1400W 12” Powered Subwoofer with Tri-Tuned Ports and “BASS BOOST” Feature for Room Shaking Bass Down to 15Hz – BIC America
Amazon.com: Jensen MSW10 Universal 10" Marine Grade Subwoofer, 500 Watts Max Handling Power, 250 Watts RMS Power, Impedance 4 Ohms, Frequency Response 20Hz - 1kHz, Sealed Housing Design, Matt Black PP Cone : Electronics