Simple & Straight circuit design minimizing distortion from the input selector, electronic volume and power amp for sound purity and free of coloration * iPhone/iPod playback via digital connection for high-quality sound by Denon"s digital audio technologies * Digital input (optical input) for your Apple AirPort Express, or your TV set for better listening experience * Triple Noise Reduction Design (T.N.R.D.) to preserve signal purity (Minimum signal path to optimize performance in sound quality, separation of digital and analog circuits, and precision signal ground circuit to preserve signal purity) * High-precision 192kHz/24-Bit D/A converters to reproduce high definition sound