Thanks for the info...much appreciated. Pity the manufacturer's data sheets/manuals etc etc don't spell this out. Despite several readings of their documentation I couldn't be 100% sure that it could be done.
Remember these devices are not designed to be used to equalize subwoofers. They are usually used during live shows or in studios. They just work extremely well with eq'ing of subs. You really can't count on the manufacturer manual/data-sheets for Info like that.
Ive heard but am not sure that you should only use them to eq subs because if you use them with your mains it will introduce distortion with subs it is not noticeable. So basically don't go above 120hz. I'm not sure where I read that tho or if it is even correct so don't take my word on it unless someone else confirms or you find another source.