Hello, I have now ventured to the system in the car. I have now insulated the front doors with alubutyl, insulation fleece and Brax insulation paste. Alubutyl on the outer sheet and the inner sheet of the door, insulation fleece over it and the damper on the lining from the inside. My system still sounds bad. Power amplifier is a Sony Xplo XM 460 GTX with 600 watts. Subwoofer is a Rodex with 250 watts. The guess I have that it is on the front system of the previous owner. It has installed: low-middle sounder: Eton Pow 160 tweeter: RAINBOW Experience EL-T19 crossover: Axton CAC 2.6 The front system is connected to the final stage, which I set as well as I did. Can it lie on the rolled-up system? I’m really guessless and quite depressive because that was so much work at dawn. 🙁 It doesn’t sound better and then break the tweeter even at high volume. So the few will be very quick.