Not in love with my system yet. Help!

@dadork 

I don't have your exact setup, but I have had combo HT/2-channel systems set up in the past. I used an HT receiver for video switching, HT source processing, etc., and had my surround and center speakers powered by the HT receiver. This was connected to my 2-channel system via L&R pre-outs, into my integrated amp, which powered the front L&R speakers via an HT bypass on the integrated amp. Sound like exactly what you have.

Just remember, your 2-channel rig is completely independent of your HT system. The HT system does not even need to be turned on to enjoy 2-channel music played via your BlueSound Node 2 (or any other source connected directly yo your integrated amp). Get the 2-channel sound/config optimized first if 2-channel sound quality is a priority.

Once you have the 2-channel rig optimized, all you need to do is connect the 2 LFE pre-outs from the HT receiver into the each of the two Subs. Per REL, you can have LFE and either the lower level RCA input, or the Neutrik connection working at the same time. After you have everything connected, run the receiver's setup routine. It will know that you have the subs connected via the LFE ports. And it should see your L&R mains as "large" since they have the subs connected to fill in the bottom end, essentially making them "large" full range speakers. And if necessary, set the L&R speakers to large in your setup.

Lastly, remember, if you have the subs connected to the integrated amp per the Neutrik connections, as per RELS recommendation you should have good full range sound when playing only 2-channel audio (independent of the HT receiver). And when playing HT, you should have full range sound from the front L&R speakers (same as when playing 2-channel only) and you should also get the LFE effects coded to go to the LFE output of the HT receiver via it's digital audio processing.

It should all work just fine, after you get it set up correctly.

Not sure if you have the input you need.  If you want feel free to PM me.
First, please be specific about what love you are not feeling.   Is it too much bass? Too little?  Bad integration? What?  Dont leave us guessing (wrong)
Sub woofers have many complications, from phase alignment with the sats, to level setting and crossover point selection, to phase consistency BETWEEN them with two.  

In many ways two ought to be easier if they are co-located with the sats reducing the phase issue. One creates problems since it can be coherent at ONE location... because.... math.
Aside from the subjective input, have you characterized the system?
Anyway, LMK. I wont wade in unless you reach out.
HNY,
G

@reubent My set up is exactly as you describe and in talking to REL and their literature that is all exactly as you describe as well. I think my issue has to be placement. If the subs sound fantastic in HT after I run Audyssey and they have been room corrected but not in 2 channel without correction it tells me the low freqs aren't arriving at my listening position at the optimal wave point. Does this make sense? I know 2 chan and HT aspect of it are independent of each other so it should be, as you said, that once I have the 2 chan right I can then hook up the RCAs and run Audyssey and be good to go. How difficult was it for you to get the crossover and gain levels dialed in? It's hard for me because I have to move something and run back and forth to my listening position. Thanks for all your help!

@dadork  - I did not have any issues when I set up a couple of different combo HT/2-channel systems years ago. I used an HT receiver and an integrated amp, in combo, just as you are trying to do. However, I was only using one sub, different model sub, and different room, of course.

My only suggestion is to forget completely about the HT side, until you have the subs sounding the way you want for 2-channel listening from your integrated amp. Once everything is good for 2-channel listening, move on the adding the .1LFE for HT, and then run your setup again.

For the 2-channel setup, you only have sub volume, crossover point, phase and location. I'm not an expert on sub placement or setup, so you might want to eliminate some confusion and start a new thread asking how to find the best setup for 2 subs in a 2-channel audio system. Don't mention anything about the added HT portion, as it will likely confuse some/many potential posters and send the thread down a rat-hole.

Again, once you have the 2-channel music system to your liking, you should just be able to run the setup routine on your HT receiver and all should be good.

Good Luck and Happy New Year.

If you are going the miniDSP route, why not get their DDRC-24 instead. It has Dirac room correction and can handle 2 subwoofers integration.