Know of internet sites about loudspeaker design and DiY?

Your list of links is quite impressive. That anyone can add more would be surprising. I found your website quite informative and I'm still in the process of reading the technical discussions in more detail. I especially liked your link to Mr. Russell's pages, listed at the bottom of your page titled 'Selecting A Loudspeaker Cable', which I discovered several years ago and still peruse its pages. It was reminiscent of an experience I had in the early seventies. Rather than iterate that here, may I make reference to a pair of pages in my website? https://www.ln271828.net/exponent.htm The whole story can be found on those two pages.
Please feel free to continue this dialogue here or through private message.