... are Input Gain, Ground Lift Switch to eliminatehum, Power LEDs, Channel 1 & 2 level, LED's indicator, stereo and bridge modes, clip ... reliable protectivedevice for short circuit, overload and over heat.Features:1) Two way crossover and subsonic(Low-cut) filter. The crossover ... Gain, Ground Lift Switch to eliminate hum.12) Power LEDs, Channel 1 & 2 level, LED's indicator, stereo and bridge modes, clip ...