Pre-war German ? Uses large electromagnet for ribbon driver & matching transformer (left) to connect to Amplifier.

This planar horn driver would eliminate the need for a phasing plug and provides some ideas for us experimenters.

Klangfilm Home! Note: this site wouldn't allow me to link to direct picture, so you will have to ,enter site, go to PICTURES,LOUDSPEAKERS, then EUROPA Junior KL-43004. to see ribbon 2-way horn.