The 40-watt (RMUXF40) and 100-watt (RMUXF100) transformer kits fit all new RoomMatch® Utility loudspeaker models after removing the standard input connector panel. The new RMU loudspeakers have two NL4 connectors on the input connector panel. These transformer kits cannot be used with earlier versions of RMU208 loudspeakers which have only one NL4 connector on the standard input connector panel.