Hey, to all freaks with a fault-free front system… I used: -The search function. -Speakingly, trying to get rid of the fieping in the tweeters of my neck, just like at the beginning, when the components were new, everything was still as pure… -The speed-dependent whistle was also short-term away, but then I heard a slight, also not to be underestimated basic whistles, deeper, and no more speed-dependent, as soon as the ignition started! I have had the mass of the radio directly on the battery, I have taken the power stages from the rear seat so that they have no contact to the mass, I have re-grimmed and screwed on the mass connections, I have put both power stages at a single mass point… – Result: NIX!!! What can I do now to get these two types of whistles away?! That completely sucks the fun!!! Help me!!! P.S.: JVC radio, Canton-QS system, 2-fold shielded chinch cable, Fiat Punto…