Compact sealed RS225-4 with RST28a and 3D printed waveguide

[augerpro]

Sorry, I should have been a lot more clear. This is only the completely unfiltered woofer. No tweeter, no crossover. I can repeat tomorrow with the tweeter.

Ah, well that makes more sense. Can you post the baffle diffraction sim?

 

[joe carrow]

Ah, well that makes more sense. Can you post the baffle diffraction sim?

Sure the first two images in post #11 are the baffle diffraction sim from vituixcad: https://www.diyaudio.com/community/...and-3d-printed-waveguide.381821/#post-6948431

The first one is with a large diameter woofer, and it doesn’t show my problem area. The second image is where I reduced the diameter of the woofer and saw the 2khz issue that I’m seeing in the real measurements.

 

[454Casull]

I'm going to guess that the widening at 2 kHz is from the other sources (e.g. diffraction from baffle edges) summing in-phase with the direct sound at those off-axis angles. Solution is probably still to play with baffle placement & ratios as others suggested, or treat all 4 baffle edges instead of just two.