If there was something wrong with the EQ causing it to surge enough electricity to keep blowing fuses it may have overheated one of the RCA's. It may have even melted some of the insulation. I hate to say it but if the RCA's are not the problem you may have to retrace all your wiring and look for bad/melted spots. If so I would start with the ground wires.... Hope the RCA's are the easy fix for ya.