How did you find going from dual to a four stack?
I had to completely reconfigure xover and gain, but once I got it dialed in soundstage became more expansive and added depth, and bass improved with more refinement and faster attack. The jazz double bass is one of my favorite instruments, and I also love listening to large scale orchestral music. Both benefited quite a bit going from a pair of S/510 to a four-pack array. Adding the third pair improved things even more, especially with multi-dimensional soundstage, and improved decay on instruments. It sort of added that last bit of sparkle and finesse.
