As a Q3 owner I can speak to that setup but unfortunately cannot compare to the D3. All I will say is to really get the best from this speaker I found it worked best with plenty of power, and tube power at that. I use VTL MB 450III. I tried a 100W amp at first but this really left the speaker sounding very flat. Magicos are often demoed with big solid state amps and this combination can exacerbate any edge.
Also make sure they are located and teed in perfectly in your room. I have them widely spaced with a slight toe in,. getting it balanced so each is perfect made a big difference. Finally tuning the cabinets with Synergistic Research HFTs was very beneficial, not because they resonate but because these big heavy reflecting surfaces interact with the room -- this is in the context of an extensively treated room (see my system)
Finally there is a lot of discussion of the direct comparison you want in the comments section here
http://www.theabsolutesound.com/articles/masterpieces-from-avantgarde-and-raidho/
Also make sure they are located and teed in perfectly in your room. I have them widely spaced with a slight toe in,. getting it balanced so each is perfect made a big difference. Finally tuning the cabinets with Synergistic Research HFTs was very beneficial, not because they resonate but because these big heavy reflecting surfaces interact with the room -- this is in the context of an extensively treated room (see my system)
Finally there is a lot of discussion of the direct comparison you want in the comments section here
http://www.theabsolutesound.com/articles/masterpieces-from-avantgarde-and-raidho/