What process did you use to integrate multiple subwoofers for 2 channel listening?

a good quality parametric equalizer or DSP would really be the simplest and most cost effective way to fix things in a problem room rather than a complex sub setup in a system that does not seem bass starved to start with.

I know, I know, more stuff in the signal path. So what? As long as its good stuff? Audiophiles get too anal about these things sometimes. THe end result is all that matters. With digital anything is possible. Them’s the facts!  Digital is your friend!  Stick some tubes upstream if you must.

Whatever works best.

@mapman -- I'm not against it, absolutely, but want to see if I can make a casserole with what I have and with the skills I have. I've spent a fair amount to have more than decent cables and DAC, so to add something into that mix is not necessarily about "polluting" the signal so much as adding an element that will change the character in unintended ways, even as it may be correcting other outcomes. But I hear you. Not ruling it out.

@tvad  That's a good object lesson. And I'm not aiming for Howard Hughes levels of cleanliness in line response. My issue is that I can hear the bump that I see measured. I tested that out last night -- I found a track of acoustic bass on a Chesky recording that goes up and down the scale, knew instantaneously where the muddy/tubby section was, measured the frequency of those notes on an analyzer and then compared to my REW graph. Exact match. If I can at least manage a couple unwieldy peaks, I will not have lifeless music, but I will eliminate flaws which my ears can hear. That's the goal.

That said, we all remember Hawthorne's short story, "The Birthmark," where his otherwise beautiful and kind wife has a birthmark which the protagonist insists on removing? Spoiler alert: the process kills her.

@tvad 
I believe that was very good advice from the manufacturer. No dsp software is perfect but you won’t succeed without. You may think so though...