Setting up the REL is clearer now that I've unpacked it and read the manual again. I'll be using the Speakon and .1/LFE to great effect, I'm sure.
I'm still deciding on a phono cable and definitely want to get a better Speakon cable (the supplied cable is much too long). I've spent more then I should have on a sub (half the LCR speaker cost), so movin' up isn't an option, but better cables and power cord is and will yield an improvement.
I have the Marantz SR5004 A/V Receiver.
Thanks for your help.