Yes. I have run 2 pairs of Quad 2905's simultaneously, but not side by side. There are theoretical reasons why 2 pairs of the modern Quads won't work together (the delay lines in each speaker create the illusion of a point source 1' behind the speaker, and you can't have two of those on each side), but if you think about it, there are alternative alignments.
And some of those work for me.
And some of those work for me.