Shaol
I'm afraid that I'm not in the slightest interested or knowedgable regarding HT, hope someone else can help you with the HT type questions. ( I'm not even sure I know what you were talking about ha ha!!)
Q2) as it's pro gear, you should find a gazillion places that sell XLS to RCA cables etc etc. Also from those sort of places, the prices are reasonable, unlike buying interconnects from hi fi stores
Q4) I guess you only need their mic if you were going to 'correct' your speakers. If you are only going to correct the bass a la BFD's and REW, then of course you can use the Radio Shack meter and REW and input the filters manually, and that is the type of thing I covered in my previous thread mentioned.
The other two questions are best answered by someone who knows what they're talking about.
(you'll notice my comments aren't factual, they only cover what I think or reckon! Can't get myself into trouble or lead others astray that way)
lots of love
terry
just re-read your question, is the only prob getting analog into your receiver?? If that's the case, then yes I spose using analog out (which you would anyway if going to an amp?) would overcome that. But if I've misunderstood your question then ignore the last
Also, meant to say that the mic you already have may not be useable, simply because I'm making the assumption that the DEQ would have a generic calibration file for the behringer mic already programmed into it.