Gallien-Krueger 400RB-IV Bass Amplifier (280 Watt) 280 Watts 4 Band EQ w/ Voicing Filters and Contour Effects Loop, Tuner Out w/Mute XLR Output w/ Ground Lift and Pre/Post High Current Power Amp 4 Band EQ w/ Voicing Filters and Contour, 280 watts. Effects Loop, Tuner Out w/Mute and XLR Output w/ Ground Lift and Pre/Post. High Current Power Amp, 280 Watts and high current poer amp.