\r\rWhether or not you need a bass knob for your marine subwoofer will depend on your head unit and your personal preferences. The bass levels can vary drastically from one song to the next, regardless of what type of music you listen to. Of course this is true with hip-hop and electronic music, but even with country music too. For example, Alan Jackson songs have more bass than most other country songs (we are not calling this new "Country" music, country music btw). Many marine marine head units have a subwoofer pre-out and subwoofer control. However, many of these source units do not have buttons on the front that allow you to quickly adjust the subwoofer level. Instead, you have to hit a couple of buttons to get to the subwoofer level screen, and then you can change the subwoofer level there. Some head units like the Rockford Fosgate PMX-2 and PMX-3 have buttons on the face of the head unit for fast and easy subwoofer level adjustment. If you don't have specific, subwoofer level adjustment buttons on the front of your head unit, we recommend adding a bass knob. Instead of fumbling through different screens and modes on your head unit, you can just turn the knob up or down to adjust the bass level for that song. If your head unit does not have a subwoofer pre-out\ror subwoofer level control, we definitely recommend adding a bass knob because the bass levels are different from one song to the next. It is nice when you have the ability to quickly and easily turn the bass up or down.\r\r