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Why are these pre out / main in just connected like this? And also, would you use this to hook up a powered subwoofer? Technics SA-R921 receiver. : r/BudgetAudiophile
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How 2 hook up a active subwoofer to a receiver or integrated amp with no subwoofer pre out on unit - YouTube
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Connect Passive subwoofer (not amplified subwoofer) to an 7.1 or more home theater receiver. - YouTube
Anyone hook up a car amp and passive sub to home theater or desktop? | Audio Science Review (ASR) Forum
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