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I am sweeping up to 400hz so there is a signal present
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Huh, and this is coming from the receiver? Simply do an REW sweep with cables that includes the receiver as the input and the sub out as the output to and from your soundcards line-in and line-out. First sweep the cable only to ensure a flat response). Adjust the Check Levels and you have an analyzer that will do a response of the crossovers in your receiver. Then you'll know for sure....
brucek