Even those speakers that use off the shelf drivers subect those drivers to rigorous tests and reject a large number of them. Kftool (an audiogon member)makes his own speakers. He however runs his own tool and die company. There are some DYI companies like GR Reaerach. They can deliver a finsihed product at DIY prices.
I like to think we are being ripped off by expensive speakers. truth is that cabinent making is labor intensive. It reqires skilled workers. That is why planar speakers are generally less expensive. No cabinent. Matching drivers and crossovers- not easy.
My suggestion is buy a kit. They might even let you modify the kit soou can oqn a unique speaker.
I like to think we are being ripped off by expensive speakers. truth is that cabinent making is labor intensive. It reqires skilled workers. That is why planar speakers are generally less expensive. No cabinent. Matching drivers and crossovers- not easy.
My suggestion is buy a kit. They might even let you modify the kit soou can oqn a unique speaker.