Yes, but the Arcam DV79 is all that's needed to decode it. You need to use the (6) analog outputs from the Arcam to the Meridian for it as the Arcam will not output full DVD-A on the digital outputs.
The MLP is only on the disc. The Arcam cannot output it and, in fact, Meridian's own players cannot either. The only way to get it out is with 6 analog connections and, if the Meridian 561 lacks such an input, you cannot do it with this combination.
The way the Meridian 561M can do this is with Meridian 596 or 800 DVD players using the proprietary MHR digital interconnections.
No. MLP (you can look it up) is a lossless compression having nothing (in theory) to do with DD or DTS. So far as I know, it is used exclusively with DVD-A and mostly, but not exclusively, with multichannel DVD-A. Also, as with SACD, there are severe restrictions on its unencrypted digital output.
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