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Hello. I have Carrozzeria bandpass subwoofer 25cm twin-drive TS-WX2500. that has positive and negative terminals on both sides, and both sides are interconnected, when i connect single side to my amp Kenwood av surround amplifier KA-V6000, one woofer has more excursion than other, do i need another amplifier or there is something wrong connecting those cable to subwoofer. plz help