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