I think I am finally happy with how things sound bass wise...
To give a quick rundown I've got a Denon X4100 and 2 subs. A Dayton Ultimax 18 in a 4 cubic foot box, and 4 Infinity 1262's wired as a single 4 ohm load in a box about 6 cubic feet total. Each sub as its own bridged Crown XLS2000 to drive it, and both Crowns are wired to a dedicated 15 amp breaker (might be 20 but think its 15). The Dayton sub is in the right front corner and the infinities are at the rear left along the wall with the stairs (see pics below).
The Infinity box is located below this sofa table I built
Here is what I did.
1. Connect the Sub1 and Sub 2 outputs from the Denon to the 2 inputs on the MiniDSP, and connect a single sub to each set of output on the MiniDSP
2. Run XT32
3. Set Xover on fronts to 250, LFE to 250
4. In the Denon adjust the distance settings between the subs to ensure they are summing constructively. In my case this meant adding case 4 feet to the distance for my Dayton sub in the corner
5. Measure the combined sub response across all three main seats via REW
6. Use REW to generate a average response
7. Use the EQ feature in REW to generate filters to put in the MiniDSP to even out response. Export those filters to a file.
8. Import filters into MiniDSP
9. Re-Measure all 3 seating locations to see if they are fairly close in response (they were)
10. Add in a Shelf filter to boost response below 30hz by 12db* (which is a lot BUT well...... its me....)
**If its too much, I can always tweak it later without having to redo much besides connect my laptop to the Mini and program it, which is REALLY REALLY NICE
11. Re-Measure to ensure all 3 seats response increased right
12. Re-Engage 80hz crossover on Mains
13. Measure response (looks pretty decent)
**At this point I tested a couple movies and was disappointed in the response.
14. I added a LFE boost to the signal of 9db in the Denon
**At this point I rested a few movies and was MUCH HAPPIER with the response. And I'm still not getting above 3 lights on the XLS so I think I'm ok.......
Here goes my REW graphs...
After redoing XT32 I took measurements at my 3 main listening positions. I increased the sub crossover to 250hz and the LFE to 250. Here are the results across all three seats:
Using the middle seat for distance tweaks I measured a bunch of different distances and settled on 20.9 as it was the most constructive. Adding additional feet didn't really make much of a difference. I also measured subtracting 2 feet from the distance on the Dayton and it really jacked up the response. I have the measurement but didnt show it in this picture.
Taking that distance and measuring across all three seats I got this
I then averaged that response and used that average in REW to create the EQ filters to add to the MiniDSP. I dont have a screenshot (but I think I have measurements) of how the response looked after applying the EQ filters only. I then added a initial low shelf filter via the MiniDSP to the response and got this...
From there I remeasured the front three seats with the Left Speaker + Sub and Right Speaker + Sub for a total of 6 measurements. Averaging those responses per speaker resulted in this graph.
I'm was fairly happy with that graph.... however in real life it didnt play right, so I added more boost via the Denon to the tune of 9db.... I am MUCH happier than that.
However I may need to tweak more and lower things down.... when The Muppets are hammering on the bass.... well it kinda sounds wrong lol...