The following feed does most of what I'd like the above ones to do, except I don't like the iTunes name of it (but I can't change it unless I change the entire website name): http://embclife.org/sermons/feed/
I turned off Bulletproof Security and WP Super Cache. In addition, I totally cleared out the .htaccess file, made sure each of these podcast feeds is marked "Active", and then re-saved the custom permalink structure. I have also tried the above links with /?feed=<feedname>, with the same results. There are no directories that are called "feed", either.
This feed worked properly in my old WP installation, and here's an example: http://embclife.org/audio/feed/embcoldaudio/
Can you help me figure out why I can't access these feeds? Thanks.