Do not use the woofer without the servo control wire hooked up. The accelerometer on the woofer cone sends info to the amp via that little wire. Sending the amp back to velodyne is your best bet. They often do little upgrades when changes were made mid year on amps. For instance I had two uld 15's purchased many years apart. The volume controls tracked differently, and they matched them up for me when I sent in the earlier model I had. The velodyne factory is very helpful and their customer service is terrific.
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