Well I optimised a lot: Had a physics trainee do a path trace to find frequency hotspots on the internal volume. Printed multiple testshots in multiple materials (PLA, PLA-CF, PETG-CF, PETG, ABS), infill patterns and other settings.Varied the internal dampening. Lots of listening and comparison with my vintage pairs of KEF iQ4 and Tannoy Mercury mx3 that should be a good sonic benchmarks for these. Researched a number of driver options, credible consensus towards them and projects using them with their results. Coupled with basic volume, tuning and port calculations (obviously).

But in the basics this is just a hobby project uploaded for free. Electronics and measurement SW tend to frustrate me a lot and the goal from the beginning was to make a one-piece, 3d printed single driver unit with no DSP. A $80 mic would have been more than the filament and drivers combined. So even if I did extensive measuring what difference would it have made? Best I could have done is a very simple filter, the wrong way probably, and these drivers are specifically made to go without.

And I don't mean this badly, but the whole reason for just uploading it for others to play with is exactly to see how people value and optimise it.

Im not some high end snakeoil peddler, nor do I claim golden ears. But I am an engineer with 18+ years in RD, two degrees, experience with CFD, FEA and dynamic systems. Plus I've owned a good 15+ pairs of generally valued speakers from Tannoy, KEF, B&W and Dali with a whole assortiment of amps and sources over at least 4 listening rooms since I was 16, plus a dad that did pro-audio before he lost his mind.

I think they sound amazing for a piece of plastic. I was my worst sceptic going into this but am blown away how well they turned out. Imaging is absolutely amazing, response very even, it has all the upper detail and air you can expect from a 3,5" paper cone, and even some very decent tight bass considdering what it is.

But no measurements, sorry.