Pro. Amplifier adopt the newest design both in art and inner electric. We'll satisfy each costumer by updating the circuit and testing unceasingly. The sorts of electrocircuit includes: AB, B, H, voltage feedback circuit, current flow feedback circuit and digital circuit, etc, which is specially designed to .stand up the damages of overheat, overload and load cutting-out, being used with our speakers optimally. To guarantee the quality and consistency of the original device,all of them have been tested and xamined strictly through the professional personnel.