Has anyone tried kharma CRM 3.1 or 3.2 with subs

How would kharma monitors mate with subs particularly REL?
I can't answer your question, but Kharma is coming out with subs that are designed to work with there smaller speakers- fwiw.
I really do not think it is necessary for most music. The 3.1's and 3.2's go down to 35 Hz flat and that is truly all most rooms can really produce. The REL sub is quite good, but I would wait for the Kharma sub which should be a much better match.