LFE out? did you mean preamp out? LFE out is exclusively for home theater if I am not mistaken (low frequency effects). If you don't use the high level inputs via the speaker cable, then I would either use the extra set of preamp outs on the preamp/receiver, or if only one set, just buy a splitter and run an extra interconnect over to the Rythmiks left or right channel RCA input.
Then on the rythmik you can best set what frequency sounds best to blend with your mains (don't have to touch the mains)
Then on the rythmik you can best set what frequency sounds best to blend with your mains (don't have to touch the mains)