DC Area Audio DIYer's Communityhttp://www.dcaudiodiy.com/phpBB3/
http://www.dcaudiodiy.com/phpBB3/viewtopic.php?f=5&t=1457
Pelliott321 wrote:http://hifiheroin.blogspot.com/2019/09/the-horn-loudspeaker-reference-book.html