I have a 2017 Nissan Altima with the stock sound system (not the Bose 9 speaker). I am happy with the sound except that it is missing something in the bottom end so I added Bazooka BTA8100, 100 watt, 8" active bass tube. This gives me what I want except that I notice that there is a lot of very low rumble (even when no music is playing) and the very low notes seem more pronounced than the upper bass notes. I have done a bit of EQ'ing to smooth out the bass notes but I think I need a subsonic filter to eliminate the rumble.
I found these FMOD units that I think will do the trick:
Although I am tapping the rear speaker leads to the high level inputs on the Bazooka and they are line level only. Is there a speaker level equivalent? I suppose if not I could go with a LOC and use the RCA inputs on the sub.
Would this combination eliminate the rumble I am getting? Also, these come in different frequencies. What would the best frequency be, given the characteristics of the bass tube I am using?
Thanks in advance for any help.