Hello all car audio lovers. Curently I have bmw e39 with shitiest saund system( no original amp) For extra bass i added Subwoofer in the trunk and connected amp through hi-low addapter connected from back deck speaker. And the problem is that subwoofer kicks just on few songs from 100+song playlist. On others songs looks like where is no event subwoofer installed. I have alredy tried to install different amp and sub but same results sub works just on few songs. Any ideas?