[Wayne A. Pflughaupt]

Welcome to the Forum, Conrad!

It’s going to be difficult to properly integrate separate subs in a non-symmetrical room like yours. As you can see, if you don’t do it right you can’t hope to achieve good response. I agree that these subs should be able to get below 40 Hz. It’s probably your placement that’s causing them to brick-wall at 40 Hz.

At this point I’d deem your current response as essentially unequalizable. Not even considering the narrow hole at ~95 Hz, you have a nearly 30 dB spread between your worst peaks and depressions. That needs to be narrowed to something like 15 dB or less if you hope to achieve smooth response.

I suggest experimenting with different locations, using only one sub, and find one that gets the best reading. Then you can add your second sub to the same location. The first place I’d try is that corner at the top right of your picture, followed by the one at the bottom right. We’ve seen this a lot here recently, people showing is an abysmal graph that’s beyond help, with subs placed in some weird location - center-wall, etc. They move it to a corner, and there’s a huge improvement – response we can work with. Here’s one – look what happened to his response when he moved the sub to the right (i.e. best) corner.

Regards,
Wayne