PRO series our HIGH CLass amplifier,was born to meet the professional quality and significant performance requirements. With outstanding thermal cooling system,top beautiful internal circuit,this series amplifier can even match with the world famous ones, All unique designs fully reflect our self-developed patent,It adopts the most outstanding circuit in the world,the A,B circuit and big power H circuit, MOTOROLA transistors and the closure of her beautiful field effect transistors endow this series with remarkable performance and quality,