[sr20de4evr]

Originally Posted by alphalanos

it all depends on the air space requirement for the subs. usually sealed boxes are smaller than ported. chances are just making two ports on your box will make it sound like crap. leave it the way it is, and if you really want to try ported, look up your subs required airspace and buy a proper box. it wont sound good unless the box is right. the port has to be a certain length, width, and it needs to be flared on the end to reduce air noise. also a sub in a ported box cannot handle as much power as it could in a sealed box due to the high amount of air spring in a sealed vs. low amount in ported.

looks like I got beat to the punch

you're mostly right, except for the end. Ported subs can handle more power than sealed (at least mechanically), not less. There is actually more pressure change ("air spring") inside a ported box than in a sealed box, which is why the cone moves less on the same power in a ported box. Of course this all applies within half octave below tuning and a full octave above tuning, below this range a ported sub will start unloading and have MUCH higher excursion than sealed, and above this range the excursion will be similar between ported and sealed.