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ToneWinner 600W home theatre subwoofer 12 inch woofer technics wooden speaker super bass AV concert powered soundbar subwoofers - AliExpress
Technics SB-AS500 Active Subwoofer Manual | HiFi Engine
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
Technics SB-AS60 Active Subwoofer Speaker System | eBay