I am living in Berlin since 35 years and I am engaged in building speakers privately and professionally since I was 12 years old. Now I want to return to my roots building DIY Transmissionline Speakers. Back in the 70ies I started to build speakers with SEAS drivers, PEERLESS drivers and GOODMANS drivers. But my heart finally fell on KEF drivers and that´s where I want to restart. Let´s see what ideas I get after being involved deeper into the exchange on this forum. Regards, Mark.