Conclusion: I installed 2 of these along with an Alpine PDX 1.600M amp in my boat. I can't believe how hard these subs hit. My system sounds amazing. Much thanks to Sonic Electronix for a great product, quick delivery, and a wonderful value. If you want to install a system on your boat, go with these subs.
Summary: I purchased one of these subs to install in a friends' pontoon boat. I always go by specs first, then price, then name brand last. The power handling and free-air installation flexibility of this unit sold me, the price is reasonable, and the Alpine name and legendary build quality are just icing.