Harrison Consoles: Xrouter


The Xrouter is the culmination of several years of development based on Harrison's existing large-scale router - which is in use over the world.  It has MADI, clock, and video sync connectors; it generates a high-speed, low-latency packetized audio stream for other Xrange devices. Full routing of any input signal to any output signal is integral to the design.

The Xrouter is a 1536x1536 audio signal router.  Any input signal (MADI or Gigabit) can be routed to any output signal (MADI or Gigabit).  The Xrouter also includes an internal 64-bit summing engine.

  • 8 MADI Inputs (fiber or copper)
  • 8 MADI Outputs (fiber or copper)
  • 4 bi-directional 256-channel, 64-bit, "X-Range" audio pipes 
  • Video Sync
  • Wordclock Sync
  • Ethernet control port

Harrison was one of the inventors of the automated patchbay, so the user interface of the Xrouter has been refined over many years to provide the most intuitive operation. The basic concept is similar to an analog patchbay: the user connects from a source port to a destination port with a virtual patch cable. Of course in this case you have an unlimited supply of patch cables. User-defined, color-coded inputs and outputs are used to allow quick recognition of the setup. Once the user becomes comfortable with their layout, the state of the router can be ascertained with only a glance. Selecting multipe sources and connecting them to multiple destinations is as easy as click-and-drag. Each aspect of the console (buses, monitoring, channel patches, and I/O) are separated onto their own pages so the layout can be clean and uncluttered. Unlmited undo/redo is supported, as is a "normalize" button which returns the router to the initial state; just like normalizing a patchbay.


The Xpander card is a miniature ethernet and MADI I/O subsystem which complements the Xrange products including the Xengine and Xdubber. The Xpander card fits into a PCI form-factor, eliminating the need for a chassis or power supply. The Xpander card may be operated in 2 different modes:

Standalone MADI mode:  In this mode, a 64 channel MADI stream and Video Sync reference are converted directly to Gigabit ethernet.  The audio stream may be directly processed by the Xengine or Xdubber.  This mode gives an Xdubber or Xengine direct MADI I/O capability.  The daughter card provides additional connectors for wordclock, tri-level video sync reference, and MADI I/O.

Gigabit Split mode:  In this mode, a portion of an incoming Gigabit audio stream is diverted to the host Xengine or Xdubber, while the remaining channels are forwarded via the "thru" port to the next device.  Internal switches allow the Xpander to divert 64, 128, or 192 channels to the host computer, while forwarding the remainder to the next device.  The daughter card is not used in this mode.  This mode allows multiple Xengines and/or Xdubbers to be connected to a single Gigabit port of the Xrouter. In many cases this eliminates the need for a second or third router in a large console.