Yes. An amplifier. Powered subs generally have a power amp only for themselves and you need to add a power amp for the bookshelf speakers.
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I would like to find a powered sub for speakers. I mean all computer oriented speaker packages have an amp for speakers. Bose have a built in amp for speakers. I would like to use my current sub the speakers terminate into what looks like an old AT style keyboard plug. I think Bose just terminated into an RCA