RCF HDM 45-A Powered Speaker. With a top-no tch two channel amplifier, RDNet networked management, RCF precise transducers, the FiRPHASE processing, and a tough enclosure, the HDM 45-A speaker improves performance. Even though it is one of the most potent composite material speakers in its class, it also offers low distortion, quick transient response, and clear, precise, and smooth sound from low to extremely high volumes. The touring business served as the inspiration for the HDM design, which packs the highest strength and dependability for intensive usage on the road into a beautiful and light-weight cabinet. When used with the RCF HDL System speakers, this speaker is ideal as the main front of house speaker in PA systems, a powerful floor monitor, or an unobtrusive infill system.