Yes, thanks. But not RELs, per their connection guide, page 16. I’ve never understood the electrical reasoning here, but I do recall seeing a discussion here on the forum. I hear you, that you’re doing exactly that (one sub with M700 monoblocs). But for some reason REL prefers you not do that …
I found more than one discussion that touches on this topic, here’s one:
From what I gathered from fast skimming, lo output vs high output connections are involved. (?)