Do i need sub equalizer to get lows from factory headunit

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passat 2012 tdi se, I have a JL w3v3 sealed, 4ohm, and sony xm1s amp pumping 40v or 400rms through it.
My headunit is not giving me frequencies below 50hz:mad:. I have my amps(40hz center) gain set to 10db, which is the max and i would prefer keeping it low as its boosting the low bass but unfortunately also the high bass

60-100hz 40volts
40hz 25 volts:(
30hz 12 volts:(:(

my sealed sub has a 3db cutoff of 43hz in 40 liter sealed enclosure

Is there are 12-14 volt equalizer for cars which can help me control this bass

or the cabin gain should balance this.
 
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