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Archimago's Musings: MEASUREMENTS: Speaker Impedance - Part 2; sealed, ported, and a few of my speakers...
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Matching Subwoofers With Amplifiers: Calculating Subwoofer Impedance | MTX Audio - Serious About Sound®
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Amazon.com: JBL Club WS1000 10" Shallow Mount subwoofer w/SSI (Selectable Smart Impedance) Switch from 2 to 4 ohm Bundled with Alphasonik Earbuds : Electronics
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Memphis Audio MB1224 12" MSeries MB Subwoofer with Selectable Impedance, 2 Or 4 Ohms - 500 wRMS - Creative Audio
Pyle 6.5 Inch Mid Bass Woofer Speaker, 300 Watt Peak Power W/ 4 Ohm Impedance And 60-20khz Frequency Response For Car Component Stereo Plg64 : Target
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