The reason for stacking the 57s was to get more output. Even in moderately sized rooms, folks were always blowing them up trying to get decent SPLs and/or bass.
I've never found (in 15 years) my CLSs to lack sufficient sensitivity to reach deafening SPLs before distorting or, God forbid! arcing -- with the right amp of course and a good subwoofer (I like the ML Depth, but whatever)
If your room is so huge they won't play at realistic levels, then don't buy two more. Just get a pair of SoundLabs, you won't need a sub either!
I've never found (in 15 years) my CLSs to lack sufficient sensitivity to reach deafening SPLs before distorting or, God forbid! arcing -- with the right amp of course and a good subwoofer (I like the ML Depth, but whatever)
If your room is so huge they won't play at realistic levels, then don't buy two more. Just get a pair of SoundLabs, you won't need a sub either!