my receipt for Karns speakers (still have them over 40 years later !)

 

https://www.hometheaterforum.com/community/threads/anyone-have-had-or-remember-karns-hand-built-speakers.199539/https://forums.qrz.com/index.php?threads/founder-of-karns-electronics.123251/https://audiokarma.org/forums/index.php?threads/karns-paradox-iii.637145/https://www.worthpoint.com/worthopedia/vintage-karns-paradox-iii-wood-stereo-137681364