The Monolith™ THX® Portable Headphone Amplifier and DAC features cutting edge technology to bring out the best in your headphones, playback device, and music library. Featuring a THX AAA™ 78 amplifier module for superior amplification and extended battery life, an AKM® 4493 DAC for an exceptionally musical experience, and Dirac Sensaround® II decoding for an out-of-your-head, larger than life soundstage, the Monolith portable amplifier is engineered for the finest in music reproduction from your phone or other portable playback device.