The Denon PMA-655 R is a stereo integrated amplifier that incorporates a range of features aimed at delivering high-quality audio performance. It supports multiple input sources, including phono, line, and digital inputs, allowing users to connect various audio devices. The amplifier typically includes a built-in power amplifier section, offering a significant output wattage to drive a variety of speakers effectively. Additionally, it may come equipped with tone control options, a loudness switch, and a headphone output for versatile listening experiences. The design often prioritizes both aesthetics and functionality, making it a desirable component for audio setups.