HH M-Series power amplifiers are high power, 2U rack amplifers designed to provide maximum performance for demanding applications . Three models are available all featuring heavy duty low noise toroidal power supplies and rugged construction. Suitable for anywhere you need high fidelity, high power amplification Featuring high quality balanced XLR inputs, user selectable input sensitivity , SpeakON(®) Connectors, binding post outputs, status indicators, Twin volume controls and comprehensive protection circuits. HH has over five decades of experience designing quality power amplifiers, and indeed was one of the pioneers in this area.