[Redzsi]

Hi! I have Harman kardon system in my 2017 bmw, and the bass was awful and I bought a sub with amp to the trunk. The problem is, if I turn up the volume in the car, the sub not getting louder with the sound system. It's just staying in like 50-60% and the mid and the high speakers gets higher. So if I listening it like 40-50% loud, it's good. But when I turning it louder, just the mid and high speakers gets louder. I have a jbl amp with 300-400 rms watt with same watt sub. I tried it with much stronger setup but it did the same thing. In lower and mid ranges was stronger but when I get higher ranges the sub stuck in 50-60% ranges. Please help!