Smart question.
Thanks for the tips. One question about that Marantz stereo receiver - is the pre-out on it the same as a sub pre-out? Or is there something more in between that I need to get an LFE signal?
Very smart question. To make full use of that feature from the Marantx Receiver, you need a subwoofer with Low Level (RCA jacks) In and Out.
So, from the Marantz Preamp Out, you run that stereo interconnect (or mono, using a Y connector) to the Low Level In from the subwoofer.
And from the Marantz Main In, you run a stereo interconnect (or mono, using a Y connector) to the Low Level Out from the subwoofer.
If your subwoofer is equipped with Low Level In & Out (Mono or Stereo, don't matter), then you're in business.
If not, there are some Stereo receivers that have a dedicated Subwoofer Pre Out, like the Denon DRA-297. The DRA-297 list for $299 USA.
*
http://www.usa.denon.com/DRA-297_Lit218.pdf
You can check at some discount stores that carry Denon products, for a much better price. This is a very nice Stereo Receiver (I know, my brother just love his, the same model). With also Zone 3 capability (it has also stereo pre outs).
Cheers,
Bob