HI Asa- it depends on the sub you p[lan on using. Personally, I would use a REL sub which is easy to integrate into the system and runs off the amplifier terminal. With a low level (RCA/XLR input) sub, if it is a stereo input sub, you are in great shape with a standard pair of interconnects. If it is a single input sub, you MIGHT be able to use a "y" connector on the preamp outputs to combine channels and you might not. With some designs this will result in a mono signal for the sub (which is fine) as well as a mono signal for the LS50's ( which is NOT fine). Of course, if you have a LFE output on the pre, that would work fine to run the sub on a single cable. Good Luck!
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