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Creative Pebble Plus 2.1 USB-Powered Desktop Speakers with Powerful Down- Firing Subwoofer and Far-Field Drivers, Up to 8W RMS Total Power for Computer PCs and Laptops (Black) : Electronics
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KICKER Comp 12" (30cm) Subwoofer in Down Firing Encl, 4-Ohm; RoHS Compliant : Electronics
26 Down fire sub box ideas | speaker box design, subwoofer box design, speaker design