Moin together, I have an Eton 75.4 (4-channel end stage), the Hertz Esk 165.4 and a subwoofer installed in my Smart 451. As HU I have a JVC KW-NT3. The power stage is controlled via the chinch outputs for front and sub on the radio. The Hertz is a two-way compo system with crossovers, to which I have connected the midrange and tweeters fired from the front output of the power stage.. The subwoofer is pinned to the rear output of the power stage. Since all this is new ground for me, I have I can set Gain and Hpf and Lpf etc. at the power stage. On the radio I can also set it all. But where do I set it best? I leave everything on the radio to 0 and set the power level, or do I take out everything at the power stage and regulate it via the radio? many thanks in advance.