You mean you want to use the output from the subwoofer amplifier in the 2.1 board and feed it into another amplifier already installed in the sub? Big no.
If it's a powered sub, it must already have the lowpass filter before the amp section, in which case you better use a split cable to feed both the board and the sub.
If it's a powered sub, it must already have the lowpass filter before the amp section, in which case you better use a split cable to feed both the board and the sub.
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