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z-Q2 Digital EQ

Is anybody familiar with the z-systems z-Q2? It claims to be a mastering EQ (and has a corresponding price tag) so I thought this might be the place to ask. I specifically wondered about the M/S encode-decode function, which changes it from applying EQ to the L & R channels, to applying it to mid and side. Is this a common mastering function?

5.1 mastering

I am doing research on the subject of Mastering for 5.1 channel delivery. I need help finding information on the subject. I'm looking for links to web published papers on the subject, books and articles. If you are a mastering engineer with experience on the subject I would like to interview you. Any tips or advice is welcomed and greatly appreciated. Thank you all, Jeremy Whaley. .