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I own a 93' Sherwood receiver who supports a/b configuration as well as 8/4 ohm loads (switch). I would like to add a passive subwoofer and use the B channel to power it, however if I connect it to 1 (R/L) channel it will play only that channel's bass so I need to mix both of the channles and make it mono. Is it possible without bridging the power (=risk of overloading the amp)? Both passive and active DIY solutions will be welcome.

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