I don't know about the C2000's, but the PA-1's can be modified and those instructions are on the inside of the plastic housing. The modification involves disconnecting a specific transistor or capacitor and connecting another. Let me know if you want more details.
Can ADS C2000 X-over be modified for L1590 spkrs?
Does anyone out there know what the modifications are to make the ADS C2000 Biamp X-over work on the L1590's? This x-over was originally set-up for the ADS L1230/1530/2030, but could be modified to work on the L1590's; I believe two capicators had to be removed, and the program switches on the back were to be activated, but can't remember the positions. ADS is absolutely no help now, all people who knew about this are gone. Help!