An external mono switch

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Here's a (possibly embarrassingly) simple question. How do I build a mono switch?

I'm designing some speakers and I'm tweaking the crossover on the one of the pair that I have gotten to the point of being able to do so. So I'd like to feed it a mono signal, but my Pearl has no such feature.

Can someone provide me a circuit I can put in a little box to go between the preamp and the amp for this purpose?

By the way, the Pearl is absolutely fantastic.
 
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