As always, good advice from Andy above, but a few things to add ...Hi guys, what I'm about to ask as probably been answered before but I just want to be sure I won't blow anything up.
I usually find my own answers but I've read and watch so much video's about sound theory that my head is spinning. I fear that I need someone to hold my hand on this one.
(I can start my own thread if it's the preferred approach. Just tell me.)
Quick recap 3 years ago after too much spending on my HT I decided to be satisfied and live with it as is. A month agodays I only had my two mismatched subs eq'd by Audysey XT32 but I "Found a great deal" on some Buttkickers LFE I wanted 3 years ago. Forward to know the great deal as become quite the expense and the headache.
I Found out that my old 1000w class AB amp had died in storage So Bought a new one (Inuke 6000dsp) for the kickers.
Then I read that I would be better to feed a clean signal (non-audyssey EQ) to the transducers so I bought a Umik-1. Then I read about BEQ so I bough a MiniDSP HD. Then took some REW measurements only to find out that I had a 10db cut at 57hz at MLP plus some other variations. I fiddled for two weeks to finally get the best result by switching both sub with one another, no our drop around 60hz. While looking at how to set up REW on a Mac I found Jeff Mery's tutorial and decided to try MSO. After taking more measurement I found out that my STSV was very bad and I've been trying a lot of thing in the past week.
After running Sims for a week I ended up with one I though looked good compared to what I had. I specified no boost but looking at the filter's report I see that it as a 15db GAIN block. I'm afraid that my subs won't handle it.
Sub 1 is tuned at 30hz and sub2 at 35hz if that matters. Should I optimize higher and use the transducer to fill the gap?
In the original measurements, it's clear that your subs are falling off rapidly below their tuning frequencies. You do NOT want to ask a ported sub to produce meaningful SPL below its tuning frequency. That greatly increases the risk of physically damaging the driver.
I would recommend changing the lower limit of your optimization range to 35Hz (limit of the "weaker" sub in this regard). The upper limit stays the same (or could be increased if desired). Be sure to change the "PEQ Parameter Limits" values for the Min and Max Center Frequency to match the new optimization range. You would do this AFTER addressing the measurement issues noted by Andy. Here's a video on taking measurements for MSO using REW. It's shown on the Mac but the process is the same on Windows. (Disclaimer: Those are my videos, but you already mentioned watching them so I don't feel awkward point you at another one.)
Use the Buttkickers to cover the frequencies below 35 Hz. You can run all of this off the miniDSP. Route the input signal to all three outputs (2 subs, 1 buttkicker). MSO filters will go on the output side for just the 2 sub outputs. The output side for the Buttkickers will need a low-pass filter to keep them from playing above 30-35 Hz. I'm not sure what slope is recommended. However, based on the way your subs roll off, I'd probably start with a 4th-order (24 dB/octave) LR filter. You can use the gain features of the miniDSP or the iNuke to fine-tune the feel of the Buttkickers (or keep them from bottoming out if that's happening).