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Speaker-level inputs or line output converter (LOC)?
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The Best High-Performance Subwoofer | Reviews by Wirecutter
The Five Cs of Subwoofer Setup | Wirecutter
The Five Cs of Subwoofer Setup | Wirecutter
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Russound ADP-1.2 Speaker-level to Line-level Adapter at Crutchfield
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Tech Talk: Choosing the Right Line Output Converter (LOC) for Your Install - DD Audio