Ultra-compact headphone amplifier system for studio and stage applications 4 independent stereo high-power amplifier sections Highest audio quality with virtually all types of headphones even at maximum volume Phones Level control plus accurate 6-segment LED output meter per channel for easy level monitoring 2 balanced stereo main inputs with independent Level and Balance controls for individual mixes, selectable for all 4 headphone amplifiers Accurate 6-segment LED main level meter for precise level indication of both line inputs 2 headphone outputs per channel (front and rear panel) allow a total of 8 headphones to be simultaneously connected Parallel Link Output allows cascading of several headphone amplifiers High-quality potentiometers and illuminated switches for long-term reliability All Mini Series models can be stacked on top of each other to create an ultra-compact signal processor solution High-quality components and exceptionally rugged construction ensure long life.