Do ported subwoofer boxes sound better?
Ported enclosures are typically used to get more output from the same power of an amplifier than a sealed enclosure because they are more efficient. They will also have more overall output than a sealed enclosure which means they can play louder overall. This gain in output comes at a small cost. via
Can I port a sealed sub box?
You can place a port in your now sealed box. A simple hole saw and drill will do the trick nicely. Youll have to determine the net cubic air space. (net= space left after the subwofer is in) Then determine what tune frequency you want to port the subwoofer at. via
What do you put inside a subwoofer box? (video)