Hi, I have an E91 as I said and had the standard sound system installed which is really not good. Now I have installed Eton in the front, so to speak Plug & Play… Nevertheless I am very dissatisfied!! The sound has become much better but the bass I have to turn off completely because the boxes start to buzz. Now I have looked at with the Alpine SWE 815 Woofer with integrated amplifier. I wanted to get the signal over the Mmidranger in the front. Correct? Now to the actual question. You can set it that way over the power amplifier that the front speakers hardly play bass anymore? Or does it not work again because of the signal to the power amplifier? Thinking error?? The radio or Navi is and should also remain original. Navi Business Bj 2012. Is my plan good or do I make it even worse? The sub under the driver is still active. Thanks already