Among the most powerful stereo amplifiers in the marketplace, VRx 2.400 excels in driving big midwoofer sections, yet showing unique refinement and outstanding musical qualities when used for driving complete systems with passive crossover. A real champion. One pin socket for Multichannel Extensions (HL12, BH12, LM24, HL24 or BSA1) and three for Control Extensions (PC36, SM24 and PRM3) insure the widest choice of configurations and calibration.