More details: http://historische-elektronik.piranho.de/. You are watching historic loud speakers with their original sound (not all sound good :)!)
Order: Jacobi Glockenlautsprecher, Gaumont Lumiére Haut Parleur, Telefunken Arcophon 8, Atwater Kent E2 Speaker, Körting Excello Konzert 2, Epoch