When you say reference levels, playing your home theater as loud like you are immersed in sound just like theater sound levels. When your neighbor knocks and is complaining, then I would say you may be at reference level
I have the AT 2200 and it sounds great. I was one night watching MI3 with my wife at about midnight when suddenly i heard the doorbell. Oops, it was my neighbor telling us that their floor was shaking. Their house was 10-15 feet away from my house. The probem was, the loft where my 2200 is located, my neighbors masters bedroom is adjacent.
Because of its natural sound quality, i bought the 4200e for my family room. Whoa, you can tell the difference between the 2 systems. More impact on the 4200e and the natural sound quality is maintained. What more the higher model- the 8200 and the 6200 whether or not there is an e at the end of the model. The only downside is that i have not played it at near reference levels after that embarrassing incident with my neighbor