IPF® - Impregnated Polymer Fiber – special material applied to the driver suspension, allowing increased absorption of harmonic distortions and improved performance. Selenium exclusive technology.

QCF® - Quartz Composite Fiber - material specially designed to assure cone great durability due to the extraordinary mechanical resistance and impermeability, which allow product applications in most different environments, specially those external having great climatic changes. Selenium exclusive technology.

MCS® - Multi Cooling System – frames specially designed with center and side holes and blades, which assure voice-coil cooling when used at high power, keeping efficiency and integrity. Selenium exclusive technology.

SPS® - Sound Protection System – specially developed to operate as a loudspeaker protection, always keeping its maximum power allowance and assuring its preserve. Selenium exclusive technology.

DPD® - Driver Protection Device – including a PTC and an HPCCR resistor, this system assures longer durability at eventual overcharge. Selenium exclusive technology.

DFC® - Direct Flow Cooling – Revolutionary ventilation system using venture type ventilation, turning coil cooling much more efficient. Selenium exclusive technology.