RDL RU-MX4L Professional 4 Channel Line Level Mixer - Microphone and line OutputThe RU MX4L is the ideal choice in many applications where a combination of balanced and or unbalanced line level signals needs to be mixed. Balanced connections use XLR connectors. Unbalanced signals are coupled through phono jacks. Each of the four RU MX4L inputs can accept either a balanced XLR line level input or an unbalanced line level phono jack input. The unbalanced phono jack LINE OUTPUT from one RU MX4L may connect to the unbalanced input of