Amazon.com: Quinn Acoustics Q8S4 8" Car Audio Subwoofer, 250 Watts RMS and 500 Watts Peak Power, 4-Ohm Impedance Sub Adds Powerful and Accurate Bass and Beat to Car Audio Systems : Electronics
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SB Acoustics - Building Your Sound - Official Website
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Amazon.com: Acoustic Audio PSW400-10 Home Theater Powered 10" LFE Subwoofer Black Front Firing Sub,400 Watts