All pa series have seperate power transformers and circuit breakers for each channel,automatic two-speed fan cooling system/tunnel,transient free turn on/off operation, two back porch crossover island sockets for plugin modules,single xlr and dual phone plug inputs each channel,calibrated and detented input attenuator control each channel.
Pa-2000 has two back porch balanced input transformer sockets for pl-2 and singnal led each channel.
Pa-2200 has eleven led indicators inputs signal and independent channel termal/short circuit/ dc voltage/subsonic frequencies/turn on and turn off/speaker protection.
All d-series have soft start protection,input sensitivity selectable,overload and dc protection, super short circuit protection,two individual cooling fans controlled by temprature and specialized sound optimization feedback circuit with perfect limiter.
