The MA258 is a Integrated Audio Amplifier with RIAA Phono preamp built in. It has three selectable stereo inputs phonograph, RCA and a 3.5mm jack for phones or tablets. The MA258 also has a very well designed headphone output so it can be used as a stand alone headphone amplifier. The MA258 was designed to have the highest level of sound quality, whether you are using it as a headphone amp or with speakers.