Scan-Speak Revelator 15M/8631G00 15 cm Midrange 8 ohm, Sliced Paper Cone, Large Ferrite Magnet This Revelator midrange has sliced paper cone technology. The slices are filled with damping glue, which dramatically reduces break-up modes in the diaphragm. In combination with the Scan-Speak low loss linear suspension and the patented symmetrical Drive SD-1 it represents a breakthrough in midrange clarity and overall smooth frequency response characteristics.