The Aphex HeadPod 4 is a headphone amplifier which can be used for four people or band members. The HeadPod 4 delivers a clear and loud sound from each headphone out. Perfect for studio rehearsals and band practice. The HeadPod 4 from Aphex has balanced 1/4" connections, a single extension from your existing headphone output or digitally via S/PDIF. Crosstalk and Distortion is significantly reduced as each output has it's own independent amplifier. The HeadPod 4 is tough a rugged metal chassis which makes it great for touring and active studio rehearsals. The main features of the HeadPod 4 include: Professional Monitoring for ALL headphone types Individual volume controls High headroom (no clipping at high headphone levels) Durable metal jacks Ultra low distortion and wide frequency response Master volume to match source level Ultra low crosstalk Works from any analog source S/PDIF Input Top panel input selection Listen longer with less fatigue Overcomes limitations of typical headphone outputs Four independent stereo power amplifiers Small size travels easily