Not in love with my system yet. Help!


I've upgraded my system quite a bit over the last couple of months and I received the components separately due to shipping delays. I got my Parasound Integrated first and all hooked up. It made quite an improvement. I received my B&W 606 S2's a week later. Happy but knew the arrival of the subwoofers I bought would really help make them shine. I received the first of 2 REL t7i subs and hooked it up as directed and the improvement in sound was astounding so I was ecstatic about the thought of getting the second which was a day later. That's where I ran into issues. I have a Denon receiver which handles the HT side of things. My mains are run through the integrated of course and the only source directly connected to the integrated is a Bluesound Node. I have been unable to integrate the subs for music only when I try with both. I can run Audysey and it did an amazing job for my HT but that doesn't do a thing for me as far as stereo. I have bought a UMIK1 and downloaded REW but know they aren't going to give me any way to correct anything. All of my interconnects are unbalanced (RCA) so not sure which unit I should get to help me along. I have looked into miniDSP but think it only has balanced in and outs. I'd like to keep cost as low as possible as wife is on warpath. What unit do I need to get? I get pretty lost in the forums sometimes sorting everything out so forgive me please for asking to shorten my time to get to my goal and going over things that have probably been addressed before. Much thanks!
dadork
@dadork  - I think some of the folks that have replied don't understand your setup. I may be one of them! :~) 

Can you please explain how you have this hooked up? Based on your original post, I think I know what you are trying to do. Here's my understanding of what you have and what you've done.

You essentially have 2 systems in the room: an HT System and a 2-channel music system. The systems are combined in that you have L&R front pre-amp out connections from your HT receiver system into your 2-channel integrated amp and the L&R front speakers for your HT system are powered by the integrated amp by using the HT bypass on the integrated amp. Is this correct?

So, you added the first sub to the HT system via the LFE output from the HT receiver. Correct? You ran Audyssey and the HT system now sounds great with the one sub connected. Correct?

Where you are running into issues is with getting one, or both subs also working for 2-channel music playback from you integrated amp.

Please reply and let me (us) know and make any corrections to my description about how you have your system set up and what you are trying to accomplish. I may have a recommendation or two depending on your reply.

And if I completely misunderstood how you have things connected, my apologies....
miniDSP comes in balanced and single ended, and you can use the balanced version in either mode by wiring it correctly.
I have a pair of Rel subs and they sound fantastic. I would recommend that you reach out to Rel customer support and have them walk you through how to connect them to get what you want out of them. I found their customer support folks to be very helpful. Phone: 510-990-6005. 
According to Kevin Deal from Upscale you are supposed to hook Rel subs to the speaker output terminals of your amplifier.
This only uses the signal not the power from your amp. 
Check out Upscale Audio's YouTube page and search Rel Subs.
The video explains it in detail.
Good luck. Those subs kick arse!