DIY Sites Transmission Line Speaker Website (excellent collection of transmission line theory information and projects) DIY Audio Projects S.P.Q.R. Acoustics Jean-Philippe Bondy's Phase Plug Study for the Lowther DX3 Driver FRD Consortium Website (large collection of freeware for the DIY speaker designer) Edge Program - Diffraction Simulator Website Arthur Ludwig's Website (well documented acoustics theory) Commercial Sites Bob Brines' Website (good introduction to TL theory/design and some high performance commercial offerings) CarderSound Loudspeakers (custom double back loaded horns) Salk Signature Sound (check out the Veracity QW and the new SongTower QWT speakers) Lowther America (my primary source for Lowther drivers and service, very knowledgable and helpful) S. M. Audio Engineering - Independent Transducer Design Consultant (download interesting and informative transducer design articles/information) Forums DIY Audio Forums Audio Round Table Forums AudioCircle Forums Music Mosaic Records (my absolute favorite label and a great source for classic jazz box collections) True Blue Music Timeless Jazz Records Evening Star Records Blue Note Records -Home Page-