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Hi Carrie,
Welcome to the Forum!
If the sub has only speaker wire for its connection, then you need a separate amplifier to drive it. A friend of mine had the same problem when he “graduated” from a HTIB to a receiver. He simply used the HTIB as the amplifier for the sub. Since you’re still using the HTIB on the other room, I guess that isn’t an option for you. What you might do is go to a pawnshop or garage sale and pick up the cheapest old stereo receiver you can find. It would work as the amp.
Regards,
Wayne A. Pflughaupt
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