... . Features are Input Gain, Ground Lift Switch to eliminatehum, Power LEDs, Channel 1 & 2 level, LED' ... inouts11) Input Gain, Ground Lift Switch to eliminate hum.12) Power LEDs, Channel 1 & 2 level, ... LED's indicator, stereo and bridge modes, clip indicator.13) Dual DC fan to ... -low noise and ultra-efficient switch-mode power supply for noise-free audio, superior transient ...