How to connect sub to 1 x BTL 2 x SE amp?

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2wice

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Howzit.

I've been using a TPA 3255 amp in 2 x BTL and it's great, but I want to add a little oomf to the bottom.

I've configured the amp to 1 x BTL and 2 x SE, I need an L/R input for the SE (got that), but now I need a mono SE input signal for the BTL.
My DAC only has stereo out, do I just connect either of the channels and hope for the best or can I sum the signal somehow?

 

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