All Halfmoon Electronics Motor Systems connect to your amplifier by plugging into the outlets on the amp. You may use the 1 motor system along with a stock motor controlling the other rotor. These systems are not designed for end user installation. Although they do plug into the amp, there is wiring that needs to be done from the controller to the moters etc. PLEASE DO NOT ATTEMPT TO INSTALL THESE MOTORS WITHOUT THOROUGH KNOWLEDGE OF ELECTRONICS. These systems deal with 3 phase 220 Volt Power. You may be killed, or worse. Retrofit Leslie Motor Systems > Motors   122/147 Style Lower Motor 3 phase inverter duty motor for Halfmoon Electronics motor systems. Set up for 122/147 style mounting. Includes pulley. WILL NOT WORK WITHOUT 3 PHASE CONTROLLER (on controller page) $ 199.00               More Information      Quantity:     21H style Lower Motor Assy 3 phase inverter duty motor for Halfmoon Electronics motor systems. Set up for 21H style Lower mounting. Includes pulley. WILL NOT WORK WITHOUT 3 PHASE CONTROLLER (on controller page) $ 199.00               More Information      Quantity:     Upper Motor 3 phase inverter duty motor for Halfmoon Electronics motor systems. Set up for upper style mounting. Includes pulley. WILL NOT WORK WITHOUT 3 PHASE CONTROLLER (on controller page) $ 199.00               More Information      Quantity: