I can't help you with wires. I am a mess, and have no experience with the projector part.
Dynamic EQ is NOT THE SAME THING as MultiEQ. Dynamic EQ (as I understand it) is sort of like an automatic "loudness" feature, where - based on your MultiEQ settings - it figures out how to tweak the sound dynamically to account for volume that is dissimilar from the measured/standard volume. The
Audyssey site explains it better. I think that Dynamic EQ and Dynamic Volume (or Dolby Volume, if that's what the AVR manufacturer is licensing) would be pretty cool, but I don't have any first-hand experience with either.
MultiEQ XT is a "better" version of MultiEQ; it is a significant upgrade relative to the number of measurement points and the processing applied.
Not sure I can be useful on the 4K thing, but I understood that there aren't even any consumer-level projection devices capable of that resolution yet.
