What is the X max of the CV woofer he is destroying. Cerwin Vega makes some woofers that have 17 mm travel. I have used CV woofers in Aitec voice of the theater, but I can't remember the model but it came out of a CV double bass horn
Looks like you have a few different outputs. They should all be same if possible. Also what is the bias voltage. Also the drivers are different. Looks like who ever repaired it was not familiar with Phase Linear specs