ULTRABASS BX4500H SPECIFICATIONS AUDIO INPUTS Active instrument input Input impedance Passive instrument input Input impedance Return Input impedance AUDIO OUTPUTS Send/Tuner Output impedance Line Out Output impedance Output level D.I. output Output impedance Output level Loudspeaker connectors 1/4" mono jack, unbalanced approx. 220 kW unbalanced 1/4" mono jack, unbalanced approx. 750 kW unbalanced 1/4" mono jack, unbalanced approx. 10 kW unbalanced Load impedance 1/4" mono jack, unbalanced min. 2.