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The Downmix Upgrade for m906 from Grace Design consists of an add-on module for the company's m906 5.1 monitor controller, which provides the capability to create a stereo mix from a 6-channel surround audio source. Grace offers a separate downmix option for those purchasing a new m906.
Note: This item can be self installed given sufficient technical expertise. Grace Design suggests talking to their tech support department before deciding whether to self install or send the m906 to the factory for installation there.
Upgrade for existing m906 owners that adds stereo downmix option