Anybody ever hear of a spl/sq box , a buddy of mine says he saw a guy that had a sub box that was sealed for everyday listening, but when he wanted to show off he had a removable wedge and a tuned port that would slide down into the box so he could db drag...is this possible? Wouldn't the airspace difference between sealed and ported specs be too different even with a port? And wouldn't it cause the sub woofer to blow very easy? If it is possible and safe that sounds freaking awsome. What are your thoughts?