3-Series provide best value for the price. All components are made in Germany. The membrane-technologie is aluminium. These membranes are strong and for universal use. This speakers cover a wide spectrum of musical energy. Easy to install and because of the ISO size. The 3.28 MK III Silkdometweeter is excellent in dynamics, resolution and staging. Easy to install with a full aluminium body & baseplate. Please choose your favorite product in the menue above.