Sometimes there are connection issues with REL when connected to fully balanced, or dual differential amps. The issue is finding the correct place to ground the sub. Try connecting the blk. wire to chassis gnd. or to the gnd. side of your amp's RCA input. If these two locations don't fix the issue leave the blk. wire disconnected and run a separate wire from your amp's RCA gnd. to the sub's RCA input gnd. .
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System: ML:5206,5302 Serafino's Nordost Lumin U1 RM15
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