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Infinity REF1000S Reference Series 10" shallow-mount component subwoofer with 2- or 4-ohm selectable impedance at Crutchfield
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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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Best Buy: Pioneer Shallow Series 10" Single-Voice-Coil 4-Ohm Subwoofer with Enclosure Black TSSWX2502
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