There is no substitute for superior sound, and the makers of Concrete Audio F1 Speakers know that to the core. Constructed with every nuance to perceive sounds naturally, The Loudspeaker Factory in Germany designed and produced a unique loudspeaker system of timeless elegance and impressive dynamics--made of concrete. Eliminating vibrations that are common with other housing construction materials, concrete construction means the only sounds you hear are resonant, clear, and full--the way they are meant to be heard.