Shouldn't This Sound Boomy?

You need to decrease the vertical scale, so of course it looks flat. 🤣

So if I ignore that and look up at the waterfall plot, you have a peak around 40-50Hz I’d try to clip with an EQ and possibly raise everything below 100 up 4 dB or so because the system is looking too flat to be fun. :)  See the discussions around the Harman curves.

The duration of the bass nodes is long, but it’s also rather smooth. Besides that 40-50Hz peak you don’t have any outstanding nodes. An EQ would clean that up immediately.

Here is the same plot with dB re-scaled and smoothing changed to 1/24 for @erik_squires 😁. I have thought about an equalizer to tame that peak. I don't understand why my bass sounds as good as it does when this looks bad down low. Am I missing something when I read the waterfall? You mentioned that the duration is long but smooth. Can you explain that?

@mijostyn the graphs above were from the listening position. The mic was in the same place my head would be in.  I did run a sweep on each speaker individually at the same distance and height and volume. Here was the resulting graph, they look pretty close until you get below 20Hz. The red line is the right speaker which has no side wall. The green line is the left and it is two feet from a side wall. They are equal distant from the front wall.

What speaker is this and what size of room?

@sunshdw the room is 15' 2" wide x 13' 9" deep with a 9' 8" ceiling. Right side of room is open to kitchen. Left side has a wall.

The speakers are Tyler Acoustics Highland H3.5