My sweet DIY Synergy Horns (Dayton, Pvr, Eton) : r/audiophile
The very low budget DIY synergy horn build - Page 5 - AVS Forum | Home Theater Discussions And Reviews | Diy on a budget, Diy speakers, Speaker box design
A large synergy horn - Bass Projects - Data-Bass Forums
DIY MEH Synergy horn on Parts express - Technical/Restorations - The Klipsch Audio Community
Red Spade Audio: DIY point source horn
Spreadsheet to design your own Synergy (or more simple conical) horns | diyAudio