Take a look at the manual, what does it say about "pre-out" the purple RCA jack. That maybe the LFE out we are after.
I'm really failing here guys! I have looked all over the web and called all the manufactures for questions about how to hook these two up but they either wont pick up the phone or simply dont have any answers for me. I have a TX-NR737 Av Receiver and I'm trying very hard to find out how to connect it to my Take Classic 5.1 subwoofer. link are below to both products. Please help me out here guys.
Link for the TX-NR737 http://www.onkyousa.com/Products/model.php?m=TX-NR747&class=Receiver&source=RelatedModels
Link for the Take Classic 5.1 Home Theater System