The AES Loop-Thru Upgrade from Grace Design is an upgrade for the m906 5.1 monitor controller that allows you to use the DB25 multi-pin AES3 connector on the rear of the m906 as four individual AES outputs in addition to its input capability.
Note:
Purchase of this item requires you to send your m906 to Grace Design for installation. If you do not already own an m906, you may purchase one with this upgrade preinstalled.