PRECISION AEROBATICS QUANTUM EVO 45 PRO HV-SBEC ESC AC-2189EVOPRECISION AEROBATICS QUANTUM EVO 45 PRO HV SBEC ESC AC 2189EVO PA Quantum EVO line features outstanding quality backed by equally outstanding service since 2003. The Quantum EVO range has developed over the years and has proven to be reliable and efficient. Unfortunately, however, this success has also attracted companies who have sought to copy our ESCs. Customers are being confused by similar packaging and instruction manual. Some vendors are