... work slow below 50 but faster at over 50, which guarantees a minimization of heat dissipation. * Adjustable gain ... (Load Matching switch at -0, -2, -4, -5dB) enables user flexibly to optimize the sonic solution ( easy matching between ... * Three Input Sensitivity Selectors (41dB, 32dB, 26dB) available, which enables users choose suitable sound source for loudspeaker. * Thermal protection system ...