Incorporating sub into my 2 channel / HT system

Iv'e been reading many blogs but still can't find exact answer to my question. I have a Marantz SR-18 receiver that I use for my HT. This only runs my center channel and sub......I don't use surround speakers as it's only a 3.1 setup.

I use a Cary CAI-1 integrated for my 2 channel listening. The Cary is also used to run my L/R mains during HT via cinema bypass loop. My mains are JM Lab Electra 926's my sub is a Velodyne SPL-800R which is currently run off my Marantz using the LFE. I want to augment my 926's during 2 channel listening as well. How do I connect my sub so that it performs double duty weather 2 channel listening or HT. Also, I want to add another SPL-800 to augment both L and R sides. I am a babe-in-the-woods when it comes to this stuff. How do I tie everything together? which in/out do I use? Do I need Y-splitters? Help!
Velodyne and SVS subs absolutely WILL NOT allow mulitple interconnects that work at the same time. I have been through that with the technicians at both companies. Only one of the connections funcitons, in a distinct heirarchy, at any one time.

Specifically what is being asked here is can he use this for LFE and stereo with seperate connections for both, that will both work. That takes a specific set up in the amp/crossover network that not many subs have.

I don't see that Polk does that either. In fact going through the manuals of the DSW's both Micro Pro and Pro it states, " CONNECTING THE SUBWOOFER TO

I have never seen or heard of Epik, but since their website does not have manuals, and states a manual does not come with the sub (????), I'm not sure how those work. If that sub is not really set up to work that way, and you have it hooked up with multiple interonnects, it potentially could cause competing signals that cold damage the sub.

Be very careful which subs will do this, and what you pay for them. I have owned many a Velodyne, and a couple of SVS (great subs, super musical and great value), JL Audio, Sunfire, Def Tech, Rel (my fav musical sub).......

Only the Def Tech Supercubes and Rel's have had this optoin that I have seen. Call the companies and talk to the Tech's before you buy any sub that you want this optoin on.
Wow, This appears to be more complicated than I first thought. I figured there would be lots of people out there in my situation with simple solution. Didn't think it would be relavent until now but I should mention I plan on upgrading system by end of year. Moving marantz and Velo sub to basement system and selling off the Cary.

Any suggestions on a good integrated amp, AVR and 2 sub combo. Likely by one sub at a time due to budget constraints $4k.......have always bought used from Agon with no regrets.

Thanks for all responses so far.
Hi Freddy50

I have my HT set-up and 2.1 channel set-up in the same room. I have a Velodyne SPL 1500R subwoofer that I was using for the 2 channel part of my system. I took a look at the back of the Velodyne amp and there is a 2 channel inputs and one of the inputs also said LFE only. I took a male RCA to 2 female RCA Y adapter and plugged it into the LFE input jack.

My 2.1 channel preamp doesn't have a subwoofer output just another pair of outputs. My HT Pre Pro has an LFE output. One channel from my 2.1 channel preamp and the HT LFE output is plugged into the Y adapter.

If this doesn't make sense you can e-mail me and I'll send you a picture of the set-up.

Now I was able to use the same subwoofer in both systems BUT it was at different times like others have said above. Another issue I ran into was that I had to keep adjusting the volume and equalization on the sub to match both systems. The Velodyne doesn't have the ability to store 2 separate equalization/volume settings. I have some flexibility with my HT Pre/Pro so I can try to figure something out with the sub.

Good luck with your search.

I find SVS Micro 3000 allows current-time listening through my phone app, and through a Bluesound Node, you can also adjust ALL sub crossover settings,sound settings, etc. ,etc. combining these two jewels in any set up. 

Some of the REL subs allow two separate inputs. Separate level controls for HT and 2 channel.