... professional stereo power amplifier with transistor. Features are Input Gain, Ground Lift Switch to eliminatehum, Power LEDs, Channel 1 & 2 ... ) Input Gain, Ground Lift Switch to eliminate hum.12) Power LEDs, Channel 1 & 2 level, LED's indicator, stereo ... speaker system, guitar speaker, PA woofer and subwoofer, professional amplifier, speaker cabinet and fiberglass enclosure, flight case. OEM and ...