Wanted to share these horns I've been working on, I initially built them last fall (like November), the midbass horn is tuned to 135hz and an Inlow design. He supplys plans, I took my own take on constructing them but was able to keep them acoustically accurate to the design, they measure quite accurately to the Hornresp modeling. They use a B&C 12PE32 12" midbass woofer, man this thing cracks, 100db efficiency, can't play bass to save it's life but it has a cone so thin it only has one side and boy does it do midrange and midbass well.
I built one first from Aruco ply and then the second from Maple ply, they are raw wood. Each one vary a little dimensionally but they measure basically the same.
The high frequency horns are obviously DIYSG Seos 24s with the Radian 745PB 1.4" compression driver
I originally, concerned about time alignment, mounted the Seos 24 to the back of the midbass horn so the voice coils of the 12" and CD were in alignment, I had them set up active and wasn't really happy with the sound possibly due to CD diffraction off the midbass horn, so I put them in the corner and worked on other projects. But last week I pulled them out and did some simple passive XO for them and built some new Seos mounts and wow, I'm thrilled with how they sound!
They measure quite flat from 100-18k and I brought the CD down to give things a downward FR, the CD is about 3db quieter than the midbass for a BSC effect and warmer sound. XO is around 550hz, 12db LR, I messed with a few configurations but ended up with a totally symmetrical XO with the same values in each, that sounded and measured the best.
Everything in the mounting stands are balanced (neither horn are screwed to anything), the midbass horn balances in the stand and the Seos sits securely in the base, the whole setup is quite stable and I really didn't feel like screwing holes in anything.
I sort of went "rat rod" with the XO and stands using some wood from some pallets at work that was nicely weathered. I figured it hearkened to the old fashioned heritage of horns =) The XO velcro to the midbass horn.
Here is a couple video of them playing with some closeup video detail, see my YouTube for more videos of them playing:
These things sound incredible, BIG with wide and deep imaging. They are so fast, high hats CRACK, the horns are so smooth, its a different sound than the average dome tweeter but when that sax starts playing and you close your eyes, it is eerily realistic.
I'm not sure what I'll do about bass in the future, I have a few other big projects but will likely pair them with an upcoming 18" Aura build I'm doing.
Lemme know what you think, I had a blast making these and listening to them.