Mid and tweeter cabinet with bitumen and felt.
https://www.buildandlisten.com/loudspeakers/cno-grand/buildprocess/d6f2d5de-9c7a-41cd-bd50-489fbf69baa5.jpeg/view
https://www.buildandlisten.com/loudspeakers/cno-grand/buildprocess/d6f2d5de-9c7a-41cd-bd50-489fbf69baa5.jpeg/@@download/image/D6F2D5DE-9C7A-41CD-BD50-489FBF69BAA5.jpeg
Mid and tweeter cabinet with bitumen and felt.