Professional Power Amplifiers, Digital Power Amplifiers, Toroidal Transformers manufacturer / supplier in China, offering 220V AC to 100V 110V AC Copper Winding Power Supply Toroidal Transformer, Single Layer PCB Double Layers Four Layers Multi-Layers PCB Assembly for Electronics and Electrical Product, Wholesale 2CH 300W Single Power Supply 50V Input 12V Output Amplifier PCB Board Module for Active Speaker Multi Channel Matrix Amplifier and Outdoor Speakers and so on.