Vandersteen Quatros or B&W 803D's

The Quatro's active bass adjustment capability will most certainly allow them to sound better near boundaries than speakers which lack those adjustments. With the sub level, Q, and EQ controls, you can accomplish quite a bit. Lower Q settings near boundaries load the room nicely.

We have set up Quatros near the back wall with excellent results.

That's fine and I agree with you to a point, but I don't think it addresses the issue of the midrange and soundstaging sounding best with space behind the speaker. In fact, I would venture that part of Richard's design with the Qs and 5s was to be able to place the speaker out in the room for best midrange performance, while being able to contour the bass to the room where corner placment would ordinarily be best for room loading and smooth bass balance. I don't think back wall placment is a bass problem so much with the speaker, you are right, the EQ does help to address that issue, but I still think being out in the room is optimal for the overall sound and balance of the speaker. Best thing is to go to a dealer, place the speakers near the back wall, then try a setup with the speakers out in the room; if you can't hear a difference, or you can live with the difference you do hear, then you know what to do.

I think the Quatro is by far one of the best values in audio period. My father has the Wood Quatro and even with his financial ability and the upgrade for free program Richard offers he feels no need to go with the 5A.
The BW model can ben very bright and forward, where the Quatro is very smooth and somewhat warm, lastly given the bass adjustment the Quatro offers it is almost a no brainer, these speakers have bass slam that excells over even some much higher priced Wilson models.

FWIW I have heard the 802Ds several times and even positioned well out from the rear wall in a big room they had warm bass, too much for my taste, clearly colored IMO. The high end and midrange were quite nice however. I have not heard the Vandersteens.

Pubul57, lets make something CLEAR.
Ken asked which speakers will/might be better for him and his situation, Vandersteen Quatros or B&W 803D's.
A matter of how much space behind the speaker is optimal for the particular brand or model is a broader disscusion for onother thread perhaps.
IMO if above speakers were placed in the same room, very close to the rear wall - Vandersteen Quatros would came on top. Are they the ones for Ken ??? Only Ken knows. Are they good enough for me ??? Well, check out my system for answers.