The sub out connection is for powered subs. To use a sub that runs off of the amp power, you'll will have to run it through the main speakers. Usually, on this type of sub, there are connectors that allow the frequencies above the sub range to bypass it and go on to the main speakers (the sub filters the lows and passes the highs on to the speakers). If your sub does not have this, then you'll have to get a separate amp for your sub to run off of the sub-out.
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