Ever think of building a Cornu Spiral horn? Now you can!

The caulk doesn't really matter except silicone is one of the hardest to get to bond properly. This is called Alex Plus. It's super cheap and runs an easy bead. Easy clean up also. I believe it's an acrylic latex. I'll go check.

EDIT: Yes and throw in some silicone for good measure. ;)
Dap | 300ML, White, Alex Plus Acrylic Latex Caulk with Silicone - 35 Yr | Home Depot Canada

omg! only 2 stars! you're gonna hear that.. you should have gone with the gold plated audiophile grade caulk :D
 
So, I'm waiting for the glue to dry a bit. This time instead of using strips of paper, I laid the glue on the foam edges and flipped it over onto full sheets that I will trim later. Left it for 15 minutes while I did the other and weighted it all down. I am hoping to glue the backs on soon.
 

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Founder of XSA-Labs
Joined 2012
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xrk, could you model the visaton BG20, or does the size of the cutout prevent it from working with your model? Wondering if it would be possible to get a f3 in the 20's

It can work if you scale the plan to 48 inches x 48 inches x 6 inches deep. It is HUGE. The f3 is about 35 Hz (average SPL is 93 dB at 2.83 V at 1m). Nice looking response though and 35 Hz is plenty deep IMO.
 

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