I currently have 2 12 kicker cvrs in a vented box on a hifonics hfi 1000.1d amp, 4 ohm load. Im wanting to get something that will hit a little deeper and lower. I don't really want to go over a 200-240 dollar limit on a 15 or higher end 12, Its in the back of a 02 hyundai sonata, mainly listen to rap. Any options? Or should I wait and upgrade later? Thanks.