PROVIDES MAXIMUM FLEXIBILITY: Mini Headphone Amplifier is designed for use with all types of headphones, offering maximum flexibility. ULTRA LOW NOISE: 4 channel stereo headphone amplifier operates with the ultra low noise 4580 to ensure excellent sound performance. INDEPENDENT OUTPUT : Headphone amp amplifier utilizes 4 channels to set independent output levels for a wide range of listening needs. INDEPENDENT VOLUME CONTROL: Headphone amplifier achieves maximum sound quality even at maximum volume. Volume of each output channel can be controlled independently. RANGE OF APPLICATION: 4 way headphone amplifier is an ultra compact stereo headphone amplifier for studio and stage applications.