Micro-Precision Z-Series provide the most realistic soundreproduction with all kind of musicmaterial. The membranetechnologie ist released the first time in 1935 by a German patent. This, more than 70 years old technology, is produced by us until today. The quantity of these handmade speakers is very limited. The productionprocess is complicated and done by us since the first release of Z-Series. In dle last centurys many big companies got inpired by the sound of this uniqe items. There are a lot of stolen ideas from the original, but the original sound and the original technologie was never reached.. Sorry for them.. We are working now since 12 years on the details of the Z-Series to get the maximum performance for your own Z-Series. Z-Series is the original, close to the original.