Ok so I have a comp D kicker 12 with a Rocksford fosgate 400 watt amp and when I listen to my music the bass sounds good but when I turn it up the highs go up but the bass weakens. My bass isn't as strong as it should be and only sounds good on a certain volume level. Do I need a bass knob to turn the bass up and leave the highs alone or do I need an equalizer to balance them out? My bass should go up when I turn the volume up not get drowned out. Do I need to change the settings on my radio or on the amp? Please help