This is a digression.
I'm not saying everyone should design their own speakers, nor do I think saving money is the reason to do so.
I do think every audiophile should get their hands at least a little dirty at least once in their hobby. Even if you only buy a $50 kit with all the parts ready to assemble, the learning experience of making your own speakers is priceless, as is the ability to tinker endlessly. I feel strongly that if more audiophiles went from amateur speaker engineers to actually building even a single pair of speakers our hobby would be better for it.
Best,
E