Fred said: The only issue I've found is that the tweeters with no L-Pad are so sensitive that they pick up an audible sustained "sssssss" sound from the amp. I would imagine at room filling volume levels I'm probably using less than one watt from a 125 watt amp.
Fred,
Try increasing the hi freq. level on the DBX and turn down the volume on the hi freq. amp and see if this gets rid of the "ssssss". If it dosen't it could be the source before the dbx. I myself wouldn't go the L-pad route The only thing you should have between the amp output and the tweeter is a cap to stop low freq (should you set a x-over freq to low) and power on/off transiets.