Report "I am experiencing lower sound output and distortion in both L and R speakers from my M-Audio StudioPro3 powered loudspeakers. This occurs at normal audio level inputs that have been tested with other amplifiers that do not display any distortion. The StudioPro3 speakers originally never exhibited this distortion. I also notice that the rear of the right speaker (power one) gets a bit warm and I notice a slight hum when the unit is powered up. I also notice that the DC output from the bridge rectifier which is about 19V DC for no sound drops to as low as 16V Dc for normal input levels with both speakers active. I tested the diodes in the bridge rectifier but none seem open. Can you provide a schematic? Does this service cost anything? I"