only for serious buyers viber whatapp selling price only 24000 F-12 speaker has a nominal impedance of 8Ω and a stand power of 400W. The frequency response is listed as 50-20kHz with a sensitivity of 98dB. It features Speakon-style input and link connectors, labeled with polarity markings (+1, -1). The plate indicates the unit was "Designed by U.S.A."