5-Series provide a smooth sound with wide and deep roominformation. The membranetechnologie of the bass-midrange is "glassfiber". These membranes are strong, lightweighted and since ten years in production. They have no own soundcoloration. All 5-Series speakers cover a wide spectrum of musical energy. The 5.28 MK II tweeter is excellent in dynamics, resolution and staging. 5-Series tweeterdesign, like the 7.28 Mk II tweeter, is the key to the next step of soundquality and makes it easy to install with an optional full aluminium housing for dashmounting.