Moin, I finished my “car-hifi-installation” today. The rear speakers are jammed, serial front system replaced with a Sinuslive SL-F165 + basic insulation of the doors + matching Sinuslive 110 Neo tweeter, in the trunk an Axton Cab 308 Subwoofer, everything is driven by a Carpower Monacor HPB-604. Everything is quite good, but I still have the same problem as before the new front system, when I only had the sub to the series LS… the Sub is just booming extremely with some songs, with many it sounds very good and also pushes very nice, but with some it just sounds terrible and it only comes out roaring, regardless of the volume and even if the basses are set to -6. I tried everything at the power stage now what goes on, from 40-100hz through all low pass filters, tried the gain controller from Min to Max to 100 different positions, but it does not work, with some lids it just roars. I know now with frequencies ni But it’s just songs with quite dominant and dull basses, they just don’t come out of the sub in a reasonable way (so it’s probably very deep, because they’ve been pushed out of the sub even at the LP filter on 40hz), it’s also not fun to listen to that. What can this be about now, how can I get rid of it? Is it on the case? Is a bass reflex with 2 “outputs, tubes…” – wrongly calculated it’s certainly not because it was a ready-made sub that is sold in this case. Any tips? Otherwise I’ll throw out the sub soon! Would be a pity, because otherwise it sounds really horny!