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Bigger=less efficient? I'll be careful not to post responses that are not pertinent in the future.
I just plugged my HD600's into the 4520 and it sounds just fine to me. Plenty of headroom, starting at the same volume I watch bluray movies and up to 0 reference level. I also have a separate headphone amp (Creek OBH-11SE) that I occasionally use and the Denon works just as well.
I really wish I could buy this AVR and remove the DVDO Edge from the signal chain. That would have been sweet. Perhaps we can hope for the additional codes to be included in a future firmware release.
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and SW2 = 3.60m. Knowing that when I try to modify this SW = 0.22m. value, it's not possible to modify it, when all others are modifiable... 


) to the headphone amp would be best? (to be able to disable main zone(speakers), enable ZoneX to use only the phones and headphone amp, still controlling volume with 4520?
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Add to your list: in the Web interface, you can access the 2CH configuration page, which is not accessibly from the on-board GUI, and which Denon has responded as "not supported" on the 4520.
Thanks for your suggestion though!










