... pa amplifier, professional power amplifier, stereo amplifier, audio amplifier, sound amplifier, power amplifier. stereo amplifier, audio amplifier, professional power amplifier, pa amplifier, professional ... for stadiums, auditoriums, touring sound, discos or other installations and touring applications that demand the finest audio quality. ModelI1I2I3I4Input ImpedanceBalanced:20KΩ, Unbalanced ...