Hi,my name is Per Karlsson from sweden.
i am 61 years old and have built and measured speakers and filters for the last 30 years and during that time i have had a subscription from the german magazine Klang & ton and later on HOBBY HIFI.
http://www.hobby-hifi.de/These magazines are by far the best DIY in the world ,but since it´s not in english most people cant read german ,but the instructions are with pictures photos and measurments very easy to understand if you have som knowlege with spekerbuilding.
I ahve seen that the TB W5-2143
Bernt timmermanns who who owns the Hobby hifi magazine has taken this driver to another level with three traps that frequency corrects it for a ruler flat frequency.
This is by far the best speaker i have built and i have put together many.,it does things no other speaker can ,but it´s not perfect no speaker is ,but it´s a fantastic sounding piece of art.
If this is of intrest for you i can be helpful in the building process.
I also rewire and renovate tonearms and turntables and build phono stages and make RCA cables for turntables that people can solder in for themselves.
Hope everything is well in these horrible times.
Regards PK
