How can I add a subwoofer to my stock headunit? - YotaTech Forums
Speaker-level inputs or line output converter (LOC)?
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What are line output converters?
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Best Buy: Metra Two Channel Line Output Converter Black TC-LOC2
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Speaker-level inputs or line output converter (LOC)?
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Tech Talk: Choosing the Right Line Output Converter (LOC) for Your Install - DD Audio
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