hi, have a problem since the installation of the system, namely the infamous switch-on when switching off also, but quieter). the funny thing about it, it does NOT come over the subwoofer, but through the 2 front left TMT ́s. what could that lie on?? z.z. I turn on the radio and immediately turn down the loudness, then it is gone (is clear). but that can’t be a permanent solution. as a system I have: radio blaupunkt Seattle MP74 with HI/LOW adapter from di etz (the sch**** radio has no Cinch outputs!!) Carpower Power 4/600 stage speakers should be irrelevant? or? at the stage 13.9V arrive, if the radio is switched on for a short time 13.7V, but goes up again to 13,9-14V. with running motor no change, only that it is then 14,2V. what could that be? at the radio possibly?