My friend made these beautiful back loaded horn boxes. : r/vinyl
Shell Speaker (Back loaded horn) for 1" full range unit by Tomoaki Shimazu | Download free STL model | Printables.com
Nagaoka Back Load Horn Speaker and others
DIY Audio Projects - Hi-Fi Blog for DIY Audiophiles: Fostex FE206En Rear-Loaded Horn Speakers
Studio Indefinit on X: "RAD • back loaded horn loudspeakers made by @assep - this one is 3D printed with plexi sides so you can see the guts! http://t.co/rx2vlLDVdv" / X
Back Horn Speaker V2.0 BL2 - Bluetooth, Active, Passive by guppyk - Thingiverse
Tang Band D4-1 DIY Back Horn Speaker Kit
Speaker Plans for a JBL 4530 Rear Loaded Horn (Scoop) C43 | eBay