The PMA-520AE integrated amplifier has a Single-Push-Pull high-current circuit to achieve strength and detail in music reproduction, which is Denon's goal for its pure audio amplifiers. The relay switch for the CD and Phono input contains an inert gas that prevents the occurrence of noise that would damage the signal. Furthermore, durable parts are rigorously selected for their contribution to sound quality, such as the large capacity capacitor block for the power circuit, high quality carbon sound resistors and high quality audio capacitors. Every single part used in the configuration of the circuits reflects this emphasis on high fidelity. For added convenience, the remote control supplied with the PMA-520AE includes the main Denon CD player control functions.