Toed in sufficiently, the controlled radiation pattern of the SP Techs will avoid significant interference from the sidewalls, so I think they'll give you good soundstage width.
In my experience, good soundstage depth requires the speakers to have at least two or three feet between them and the wall behind them. Absorption and/or diffusion of the first reflection zones on that front wall would probably help. Imagine placing a mirror on the front wall such that, from the listening position, you could see the reflection of the inner edge of the front baffle, at tweeter height. I'd treat the area where that mirror would be. There would be one such area for each speaker.
My compliments on your fine taste in amplification! ;o)
Duke
dealer/manufacturer
In my experience, good soundstage depth requires the speakers to have at least two or three feet between them and the wall behind them. Absorption and/or diffusion of the first reflection zones on that front wall would probably help. Imagine placing a mirror on the front wall such that, from the listening position, you could see the reflection of the inner edge of the front baffle, at tweeter height. I'd treat the area where that mirror would be. There would be one such area for each speaker.
My compliments on your fine taste in amplification! ;o)
Duke
dealer/manufacturer