When I read some litt on the subject and tried it...it really worked for me...I had Timpanys1d...(I'm looking for another pair). Planars and esl's should be at least , in my opinion about 6' from the back walls and as close edgewise to the side walls. Planars cancel bass freq when placed close to back walls unlike dinamycs which do the opposite, placing them close to sidewalls also helps a lot. I used to get unbelievable bass from my timpanys in this fashion. i used a Acoustat TNT 200 with an audio research SP-14 tube preamp. Hope this helps you..
Rol
Rol