SPL Phonitor X - Headphone Amplifier and Monitor Amplifier (Black)The Phonitor x is both an outstanding headphone amplifier and an excellent preamplifier that can be used to directly drive power amplifiers or active speakers. With the optional DA converter, it not only plays from analog sources, but also directly from digital sources. The Phonitor Matrix allows speaker like listening via headphones. Thanks to VOLTAiR technology, it offers all this in the highest possible sound quality. Great sound for all headphones