Scan Speak - 15W/8531K00 - Midwoofer 8 Ohm Revelator

Datasheet

The Revelator midrange and midwoofers, both well known for their sliced paper cone 
technology. The slices are filled with damping glue, which dramatically reduces breakup modes in the diaphragm. In combination with Scan-Speaks low-loss linear 
suspension and the patented Symmetrical Drive (SD-1) it represented a breakthrough 
in midrange clarity and overall smooth frequency response characteristics.