hey guys I have a noob question here. I have 2 possible upgrades I am considering. I currently have a single polk db12svc 4 ohm in a sealed box with a fosgate p-300-2 bridged, I plan on either getting a second sub along with a custom ported box from dave the box guy and a kicker zx750.1 running these at 2 ohms or selling my current set up for a single high end 12 such as a DC level 4 or similar, along with a box from dave. I do not want to have to get a bigger alternator or extra batteries , my usable trunk space for the box would be 36x16x16 max . I am looking to have a good balance of sq and spl , maybe leaning slightly more towards spl. I previosly had 2 pioneer champion 12s and an El-cheapo 3000 watt amp in a sealed pre fab and it was mearly ok, I know dave can make some amazing boxes though. So out of the 2 builds what could I expect spl wise from each one? which build would be better? my car is an 06 pontiac G6 btw. Any other suggestions will be appreciated as well, thanks