RCF ART 732-A MK4 Powered Speaker.In its class, the ART 732-A speaker is distinctive. The 3.0" voice coil neodymium compression driver with a titanium dome gives exceptional vocal clarity and sound projection. A precise, deep low frequency control and an incredibly linear response are features of the 12" woofer. Modern assembly technologies are used to create the transducers. The DSP that manages crossover, equalisation, phase control, soft limiting, and speaker safeguards controls the 1400 watt amplifier.