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1PC Low-Frequency Vibration Speaker SubWoofer Plane Resonance Speakers Bass Sound Music DIY 8OHM 10W 30W : Amazon.ca: Electronics
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Amazon.com: CHOOYO 3Inch Subwoofer Speaker 4 8Ohm 25W HiFi Woofer Bass Speaker for Home Theater Audio DIY Loudspeaker Accessory 1PC (Color : Square 8 ohm Speaker) : Electronics
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Archimago's Musings: MEASUREMENTS: Speaker Impedance - Part 2; sealed, ported, and a few of my speakers...
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