Sealed
I built mine myself, with a little help from You Tube, home depot, & tons of silicone. I couldn’t find anyone who made an enclosure the correct size for my trunk. It’s a working trunk so I needed the room for piles of crap. You just need to make it air tight. Remember that sound is not that important in a convertible, it leaks out everywhere. It’s how good you look when the top is top down. So if your crafty and you want to give it a shot we can talk next time we meet or call me.