INSTALLED MY 2 10W7 AND 2 500/1 TODAY... IN 2 DOWNFIRING SEALED BOXES, PUT ABOUT A 5 INCH LIP ON THE BOXES... PRETTY DAMN LOUD, SOUNDS GOOD TOO... NEED TO BOLT THE BOXES DOWN THOU, THEY MOVE AROUND QUITE A BIT . IM NOT USED TO SOMETHING SO LOUD, SO ITS A LITTLE DIFFERENT FOR ME... BUT MUST ADMIT, FOR 2 10S ITS PRETTY LOUD... AND SOUNDS GOOD TOO