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The challenge rules:
Minor rules include:
The challenge I saw was finding a tweeter that can go low enough to mate with a large woofer. The GRS 3 1/2" open back tweeter will do that and I assume that it's closed back version won't go low enough because the rear chamber volume is too small. I'm going to experiment with my own larger rear chamber to see if that's the case. https://parts-express.com/GRS-PT2522-4-3-1-2-Planar-Tweeter-4-Ohm-272-122?quantity=1
My goal for the woofer was to find something that would go low and still be able to go high enough to mate with the GRS tweeter. It looks like the Dayton DCS205-4 subwoofer would do that. https://parts-express.com/Dayton-Audio-DCS205-4-8-Classic-Subwoofer-4-Ohm-295-200?quantity=1
Modeling the woofer in 1.2 cu. ft. gives an F3 of 31 and F10 of 26.
My first rub is that the faceplate for the tweeter is 4.25" by 3.5" so I have to cut the faceplate down or 3d print my own to get under the 4.125" limit.
I picked up the woofers with the 15% black Friday discount. I'd already picked up the tweeters and faceplates with an earlier 20% November discount. Time will tell if I can make this work.