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Speaker-level inputs or line output converter (LOC)?
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Sansui 881 -- Can I use a subwoofer with speakers on this system? | Audiokarma Home Audio Stereo Discussion Forums
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Rear speaker wiring good for high level input? | Porsche 718 Forum
Classic Car Stereos: Tech Article: How to Install an Amp with High Level Input
Speaker High Level Input Plug 4-Pin CROSSFIRE Amplifier Series CFA BMF VR | eBay
