The Leslie Model 600 is not your average Leslie speaker cabinet. It was designed specifically for multi-channel organs, such as the Conn 651 theater organ. It contains a total of 6 speakers: three 6x9s for the complex voices, a treble horn and Rotosonic drum for the tibias, and a woofer for the pedals and low end. Not only that, but it also contains a space generator, which is responsible for tremolo and multi-rank effects. It’s pretty remarkable how much they fit into this cabinet!

Surprisingly, there’s very little information out on the Internet about this model. Perhaps they weren’t very popular? They don’t seem to pop up for sale very often. But man, do they sound great! If you have a Conn theater organ, do yourself a favor and find one of these. They really enhance the sound of these organs.