Thinking about switching up the sub and going with an 18"nightshade from my 15" treo ssx. Which will be louder off ~2400w daily (may add more power down the road). Also, would I be able to keep my same box? Its 3.5 cuft. @ 32 hz, don't remember how many sq. in. of port it has though. How deep is the nightshade? My box is only 12in deep
