Calvin I assume you've checked with Velodyne and they won't sell you a replacement amp? If not you should try that.
USING AFTERMARKET PLATE AMP FOR SUBWOOFER
Hi good morning my name is Calvin. I have a Velodyne HGS15BG in immaculate condition but it is missing the OEM PLATE AMPLIFIER. The Velodyne series has a rated high gain servo amplifier of 1250rms 3000w peak. I've been searching for the amplifier but have been unsuccessful. Does anyone know of a distributor ship that may have the oem plate amp for the HGS-15BG??