I have a pair of KefKit speakers which my father bought in 1970 and my father and I built the cabinets according to KefKit instructions. They are now 35 years old and are still producing high quality sound, even compared to new speakers. My wife is not keen on them as they are rather large and I am looking to sell them. If you are interested in purchasing these speakers or if you have any useful information about said speakers, do not hesitate to contact me via e-mail.