Gallien-Krueger MB2-500 500-Watt Ultralight Bass Amplifier 500 Watts 3lbs. 12oz. Weight Footswitchable Boost Footswitch Included Digital Power Amp 500 Watts power Footswitchable Boost Footswitch Included Digital Power Amp Footswitchable boost channel with independent volume control to dial in just the right amount of grind and level boost when needed Legendary four-band active EQ and contour control Four-band Active EO with Variable Contour 1/4-inch Input Jack - Effects Loop , Selectable Line/ Headphone Output XLR Out with Pre/Post EQ & Ground Lift Switch