I've heard the term "differential amp", but I don't know how to tell if an amp is differential. What is in contrast to a differential amp? (A high-current amp??)The problem with the differential amp is how the power is supplied. She told me that it can damage the electronics in the speaker and did not recommend using it. So its not a question of having enough power, its how it is supplied. Differential amps are supposed to be better for non powered speakers. I dont remember a thing about how a differential amp is special.