I have a pair of r-41 pm speakers hooked up to a turntable, and I was just given 2.1 computer speakers with a sub, and I want to hook the sub up to the speakers hooked up to the turntable. The back of the speakers have a round sub out port, but the sub just has a power plug and a port saying pre-amp in, i can not figure out how to hook these up, is this possible to do?
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