what pioneer sub is it and how many watts are you feeding it?
Also is the box made to spec or did you just use any old box?
get a multimeter and check the voltage your amp is getting. could be the case of bad wiring/earth not feeding the amp enough volts.
if everything is in order and you just want more loudness... get a bigger amp and a better sub... id max
ps. splits wouldnt do much good in your case as rnb/rap is more towards sub bass than mid bass.
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