RCF cares about your sound. The new D-Line MK4 speakers boosts the performance with a series of brand new transducers, improves the sound quality with the revolutionary FiRPHASE processing and renew the grille design to exalt the professional look. The vocals are natural, the sound is clear at long distances, the SPL power is stable at very high levels. The concept of the HD-Line derives from the touring industry, bringing in an elegant and compact cabinet all the experience of RCF professional sound with the maximum reliability and strength for the intensive use on the road.