Grado Gold loading with the Gram amp2SE

Hi folks, Grahm, it's nice to hear from you. Good call on the Tandy book and the usefulness of building from it. I think I have that book- I was 19 in 72' and haunted the local Radio Shack & Lafayette stores. it is indeed a Karlson Enclosure. They were marketed by Dr. Karlson as kits in the 50's and were very popular, although their sound often left a lot to be desired. If you sold the kits through your tv repair shop, you were given a record of a thunderstorm to be played for prospective clients. If that didn't sell them, you blew out matches held in front of the ports. You are also right that it is not a viable design as originally depicted; it would be a pretty awful sounding speaker for a number of reasons. If I can figure out how to download the file I'll do so. It was a very successful project that I would encourage anyone to take on if they want a complex, rewarding project.  They are the gold standard of all of my (discriminating!)audiophile friends.