I've been designing DIY speakers for about over 15 years. At first, it was about getting better quality than I could afford from commercial speakers - then it became more about being in control of my own destiny (instead of complaining about the state of the art, creating what I wanted. If I wasn't happy with what I had, make it better.) I don't profit from the designs I have created, except for a few I did for Parts Express as a member of their speaker building design team that I received free parts and a small 1 time payment.
Two of my designs would probably be in widespread enough use to be relevant in this forum (the Helium's and the Perfectionist crossover for the HiVi DIY 3.1). If I submitted them for review, it would be to help answer the question: Is it worth it to build these designs vs. buying a commercial speaker? Oddly the designs of mine that gained the most popularity weren't my favorites either from a measurement or sound standpoint. The Heliums are so small, they are by necessity full of tradeoffs just to get everything to fit in that tiny box. The DIY 3.1 crossover was constrained in that I wanted to keep the cost down (accomplished primarily by keeping the big inductors unchanged from the original HiVi kit) and wanted people to be able to use the circuit board supplied with the kit.
I have found this forum pretty well-aligned with my basic audio principles and priorities, so I appreciate what Amir and others are contributing here. From an electronics perspective, I have gone through quite a bit of equipment, dating back a couple decades before I started designing speakers. At this point, I value neutrality and accuracy above all else because I want my speakers to be voiced against as neutral and revealing a reference as possible. I also appreciate value. I currently run an SMSL M500 as a dac/preamp into a Rotel RB-991 that was abandoned to a recycling facility because the former owner apparently didn't realize there were internal fuses... Per the Stereophile measurements, it appears to be pretty neutral and solidly engineered and it sounds as such. I've also used a number of other amps with varying degrees of success ranging from higher end to pro audio to little class D amps.
So, if any of my designs are of interest or value to the community here, I am willing to send them in (assuming I still have them). If not, that is fine too.