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Mono Combiner - What would you do?

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I need a mono combiner for a sub woofer that does not impose crosstalk or other distortions on the source.

Cheap and easy is taking left and right through two 100K resistors that are simply tied into the low pass filter input. Some crosstalk potential here. Should the filter be passive input or better with a CF in front?

How bout using two cathode followers to isolate the sum resistors? Remember this will feed a sub woofer so CF horrors are not a big deal.

Any other ideas appreciated.

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