Mtx Audio 10" 300W 84.9 dB 4 OHM Single Voice Coil Subwoofer TN10-04 (4 Pack) - Walmart.com
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MTX Audio Jackhammer T9922-44 22" car audio subwoofer drive unit (basket ball for size comparison) | Car audio subwoofers, Car audio, Subwoofer box design