The Wilson voicing technique could be used with any speaker to get them as close to the back walls as necessary. Basically put your back against the wall and talk and listen for when your voice changes, tape the floor (that is the min distance between the front driver of the speaker and the back wall) Now do this again walking from each side wall and mark again on the floor. Once again another min. You could also calc base nodes out and move them out farther as need to minimize the nodes at your listening point. Then figure 1.2 times the distance between the speakers to the listening position. I run an extreme near field arrangement with the speakers 1/3 of the way into the room with my head against the back wall, so don't be afraid to try different setups, but the basic Wilson setup is pretty amazing...then again your Wilson dealer will uncrate the speakers at your house and setup them up/voice them for you! Remember to mark his position and then make adjustments from their. Wilson are also designed to be pointed directly at the listening position (to minimize room (sidewall) interaction problems) so from the sweet spot you should barely be able to see the inside of the speakers. The distance from the speaker to the sweet spot is used to calculate the spike to adjust the angle on the WATT (Top piece), these mathematical models make setup quite easy and extremely rewarding. You can also vary the bass response based on the spacers for the feet (which also changes the head angle, and then that is reflected in the chart on top of the puppy)..
If you choose to use Tubes, Wilson has included an additional Tube port for the WATT to reduce the damping requirements from the amplifier! Everything is Designed to the 'T' and explained in their manual (which unfortunateley isnt' available in PDF)
But then again these articles document this technique called WASP.
http://www.tnt-audio.com/casse/waspe.html
There is a Stereophile article also describing this in more detail.