Hi-Res Audio Certified, Compact D-Class 4ch Amplifier, One-side Terminals for easy installation, Speaker Level Input with Signal Sensing Turn-on, Output Coil with Magnetic Shield. Faithfully reproducing the finely carved details from a Hi-Res Audio source, down to every last grain of sound. Portraying a rich sound that delivers a subtle ambience overflowing with presence and with no hint of muddiness, we have realized a mellow treble, vocals that convey every inflection of the original, and a full and incisive bass