Woofer Amplifier Circuit Diagram - Product Description. The PCA3 mini stereo power amplifier from Pyle provides up to 75W of power on each channel at 4 Ohms. Connect your inputs using the RCA jacks, and output an amplified audio signal over standard speaker push jacks.. View and Download Yamaha Aventage RX-A3070 owner's manual online. Aventage RX-A3070 Receiver pdf manual download. Also for: Aventage rx-a2070..