Hi, my system is running now. have the Focal 165V Slim Line inside ( 60 Watt RMS ). They are fired with a bridge QM75.2 with 2×75 RMS. Now I tried the system once and the power amplifier uahc net wide open. On the radio I heard first normally, everything is fine, but when I turned up a little bit wide, so funny cracks came. Just like a short bang in the middle time again and again. But that also only with one song where the bass is a little more violent or deeper. ed goes all the way. So far my amplifier runs so that it lets all frequencies through. If I turn on the filter, so only play from a certain frequency range upwards, then it sounds ok, but then there is hardly any bass. have only d2 modules so far for it. Once 130Hz and once 250Hz. What could be that and which frequency module would be the most suitable ? 80Hz? Or is the 130Hz model the best? I just wanted to have some kickbass mfg Fishly