The KF850zf performance is enhanced with a neodymium,Orbital Magnet Array™ HF driver offering increased surface area for better cooling, and higher reliability, a new HF horn extends HF response and fidelity while minimizing throat distortion. The KF850z's advanced performance will not be sonically compatible with existing KF850E inventories. To facilitate integration, kits are available to upgrade them to the KF850z. The KF850z's enclosure and rigging hardware are fully compatible with the KF850E Series. However, the "z" enclosures incorporate a stacking pad on top that mates with a recess in the bottoms. KF850 Series applications continue to include: concert tours, corporate events, large theaters, stadiums, cathedrals, large live music clubs. This model has been the touring system standard for well over 15 years. Legendary KF850 Virtual Array performance has been enhanced with a neodymium Orbital Magnet Array HF driver, offering increased surface area for better cooling and reliability. An upgraded HF horn extends response and fidelity while minimizing distortion. The MF subsystem is based on EAW's Radial Phase Plug design used in other premium KF Series models such as the KF750.