neumann kh870

Hi guys, I currently run kh 120s with the 750. I need a mid/far field speaker (2.2) for a bigger space I'm moving the set up to. I was thinking of upgrading to the kh420s and buying an additional 750 dsp to sit under it, like a poor man's 420+870 set up. 1) I believe you can run multiple 750s...