did you figure out the measurements for the rear speakers. I am about to upgrade my system also and wanted to make sure. I am also having a hard time even removing the grills. any suggestions as I don't want to damage anything. Usually the speaker grills just push and twist off.
Did you figure out how to remove the speaker grills. I am about to replace my speakers also but I was having a hard time removing the covers and don't want to damage other things while accomplishing this task