Might not be the smartest guy in the room, I don't understand why this is so difficult.
You have 1 amp, 2 subs and 2 speakers.
You are going to be using line level inputs on the subs. You have L/R subs
Amp has L/R outputs
There are L/R speakers.
Easy way is to go....
amp-LSub-Lspeaker
Amp-Rsub-Rspeaker
You can do that a few ways run speaker wire to the sub, speaker wire from sub to speaker. Or you can bi-wire sub/speaker
The other way if you want speaker fist to not degrade the signal is...
amp-Lspaker-Lsub
You can us a spade from the speaker to the sub.
Keep it simple, don't overthink it, don't think you need to buy a bunch of things and have a tangled mess to hook up. Also use the crossovers and filters on the subs. I don't have subs on the 2ch stop, but have 2 big subs on my HT setup. Hooking them up was easy, getting the XO point, location and level set was the most difficult. Also when done, make sure the subs are in phase. That will kill this entire process.
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@mswale , if OP hooked up to both of his subs from amp + to + and - to -, and then he went from his subs to his speakers in the same manner (+ to + and - to -) is there any reason that his subs (or speakers) would be out of phase with each other? That is a serious question; OP did report that he felt that things sounded "thinner."
@immatthewj not always the case. My HT subs are hooked up LFE to my receiver. Only other plug is the wall outlet. When I swapped out my HT receiver, and was doing the room correction. It was telling me my subs are out of phase. Checked the phase switch, both pointing up. Then I flipped one, and they were in phase, but out phase with the front channels. So swapped them the other way, and was good to go. Same went for one of my Dolby Atmos speaker, it's wired internally backwards, been listing to this way for years with out knowing.
You never know, and they need to be tested, it's easy....
Turn on the subs, play some bass...
Then turn your balance to the R, listen, then to the L, listen, back to center.
If the bass is loudest at center they are in phase, if not, they are out of phase.
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I ended up with this, it has more (too much) bass for sure but I will play with it, check the phases as advised above and figure out the right settings. It did push me to dislike my amp as it has connection issues, I almost have to hit it with a hammer when I turn it on.
Yes, that is what I suggested, it should work just fine, as you want all the power to do to the mains first, then fed the subs.
Now comes the "hard" part, setting up the subs. Would start with both sub gains in the middle, and crossover at the main speaker low cutoff. You don't want both main and sub to be pumping out the same frequency, you want the subs just below the mains to fill, not add to. If you think it's too much, most likely they are in phase. Out of phase it can sound hollow.
On the volume, listen to a good bass song, and try to dial in the sub volume to match the mains. It will MUCH lower then you think. My subs on my HT are set to around 3 o-clock and 60hz XO.
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This is becoming the most consisting thread.
Your 2 subs start at 80
Your Mains go down to 40.
Why did you get 2 subs in the first place? Your bass is going to be muddy, that is a lot of overlap. Might need to put a low pass filter on the mains like this
low pass filter
But then you would need to rewire the subs. 
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@grislybutter Yes, confusing.
Normal sub cutoff is 60-100 hertz, your mains go down to 40, and the lowest your subs can cut is 80, maybe try 100? There maybe a variable lowpass XO out there for you, that way you can dial it in.
One sub can work just fine, usually you add another to balance it out, and fill in the bass holes one sub can create. A lot of that can be cured with sub placement. I have found with 2 subs, that you can great bass, but it can easily overpower the mains, becoming the focal point.
This entire setup is starting to feel like a compromise. As nothing is really working with each other. This has me thinking, does your amp, have a speaker A/B switch? Not sure why no one talked about it. You can just wire the subs to the B connections, then put the low pass filters on the A speaker, both with will get full power.
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LOL, knew I opened up a can-o-worms.
There are of course several ways to do this.....
Using RCA cables, they make filters that attach right to the end of the cable, then go into the amp.
They also make ones that go on the speakers these would go in series with the speaker cable, through the XO, then out to the speakers.
For both options you would need 2 pieces of each. Both are about the same price, with their own pro/con
Yes, you would want a hi-pass filter for the mains, and a low-pass for the subs. Sorry for the confusion
high-pass
Hi-pass RCA
here is some info so you can better understand....
https://gr-research.com/hi-pass-filters/
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so the High-pass RCA link is the simplest, it's a plug that has the filter inside? All the signal that comes out of it is above 100Hz? Reading the reviews, it's simple and effective.
Yes, that is what it does, blocks everything below 100hz. Just plug it in on the RCA cable.
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Think the subs are wired up correctly for what you have. The filters will help.
You can try to move the subs out next to the mains, or even (gasp) stack them. In your room, stacking might help.
Can you use your turntable with the sub right there? It looks like a very crowded room. We are here to help you spend thousands of dollars. Might be time for a better rack/cabinet setup to get more room.
BTW, you NEED way more vinyl. 
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That's a good cartridge. Also looking for a new one myself, going to get a Sumiko one. Other then buying new music, it's amazing how much money we can spend on all the little things. Also trying to sort out footers on my gear, so many choices! Don't want to spend more on them, than what the gear cost.
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@mswale yes it’s like an animal farm, the more you have, the more it continues to cost. Kind of like when I walk into a rich person’s house, my first thought "nice but I would not want to pay the utility bills!"
Since you sound like a vibration guy, how would I stack them? What would I put between the subs and the speakers?
Still working on my vibration solution. This stuff gets stupid expensive. A little piece of metal with a few springs, $600 EACH!
For the subs, you got to find a spot where they add bass, but not standing waves. A corner of the room, or in the middle of the speaker is a good starting point.
I found these cheap little squares, they are under a lot of my equipment. Put them under the footers of the subs, if you stack, put them between the 2 subs as well. They work surprisingly well. ISO pads
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@mswale I have the foam and cork, if I just stuck it together, could that work?
Not sure about that stuff. It might be too squishy. The link provided is made for equipment vibration. Like I said, it has worked wonders for me. Really is one of the bargains out there for this kind of stuff.
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