Hello, in the hope of finally being able to solve a problem, I now also turn to the forum participants. Have an Audi Cabriolet ( Audi 80 ) built in 1992, 2.3 liters. When I bought about 4 years ago the original radio with original loudspeakers was installed. I had an JVC KD – R 301 installed in the specialist store. Now I have the following problem. I drive with the car above the 100 km/h the playback over all four loudspeakers is so distorted ( pulsating noise ) that almost nothing can be heard. No matter if I have the radio switched on, a CD played or the MP 3 player is operated. If I am below the 100 km/h everything is again in the green area. DEr specialist trade has checked the radio as perfectly. The store is now no longer available. In the meantime, on recommendation, I have exchanged the FrontLS ( Nokia ) against Crunch DSX 42. It has not become better. I have now discussed the frgae with various dealers. Unfortunately I do not get any answer, the answer leads me to a mistake.