Hi guys new to forum. I'm looking for s good quality subwoofer to replace my American bass xfl. I have a nvx jad1200.1 running at 1 ohm. I'm looking at a DC level 3 or 4, also Skar vfx and a zvx. I was also told the sundown u series was a great upgrade. I listen to a lot of different styles of music. I want it to be lound but also have punchy bass. It's going in s jeep grand Cherokee in a custom made birch box. Please let me know your thoughts. Thanks for the help.