D Line Durability, Portability, and World-class RCF Sound From public address to pre-recorded music to even live music stage monitoring, the HD 10-A MK5 delivers world-class RCF sound in a highly portable package. This loudspeaker's pairing of a 10-inch woofer and 1-inch frequency driver produces a clear, natural response that's particularly adept in vocal applications. Combined with a robust 800W 2-channel Class D amplifier, the RCF HD 10-A pushes out up to 128dB max SPL. At the same time, the 90° x 60° wide dispersion constant directivity horn ensures even, sweeping coverage across your entire audience. Plus, a host of DSP and utility features, including Bass Motion Control, Boost/Flat switch, Mic/Line, and RCF's FiRPHASE technology, allow you to precisely tune your sound to excel in any environment. Finally, RCF's D Line family of speakers sports an incredibly heavy-duty polypropylene composite construction that reduces vibrations drastically and gives the HD 10-A