From their website:
Established in 1969, Xantech Corporation designs and manufactures an extensive range of state of the art A/V distribution and control systems, and component products, many of which have become the de facto industry standards. Since 1969, over two million of these systems have been installed worldwide.
The Xantech product line includes LCD Touchpanel Controllers, multi-zone, multi-source audio/video systems, multi-zone, multi-source pre-amplifiers, multi-channel audio amplifiers, infrared receivers, remote control switchers, interface modules, IR connecting blocks, IR emitters, volume controls and IR accessories. Products are sold to professional installers and distributors directly from Xantech.