sealed or vented

so im better off getting an sealed box but why do i keep seeing all them vented boxes like they are suppoes to be better

the reason you keep seeing vented boxes is because they are better and aparently if you are going with two 15s then you want a lot of bass if you only wanted SQ you would of probly just got one 10 so if this is the case then you need to go ported I would suggest about 4 cuft per sub with the ports tuned between 35-40 hz

Ported boxes arnt always better. They dont have as flat frequency response as a sealed box and they lower your subs power handling. Just because some one has two 15s dosnt mean they need a ported box. He should't need to go ported in this case because he should already get tons of output without the loss of powerhandling ,the larger box size ,and not as flat response. Think how big a ported enclosure would be if each speaker needed 4 cubic feet of airspace! STICK with sealed.

This car has like a 6 body trunk, 12 if you chop them up, so yes the airspace is there. It does not mean that you have to use it though. The poster needs to decide what kind of response he is after, loud and obnoxious bass or decent flat response that will still play loud (and two of these will play loud no matter what). Subs lose power handling below the tuning frequency, this is part of the reason that a subsonic filter should be used and is in fact recommended from Kicker for these subs.

Power handling of these subs and for most subs at the tuning frequency and below goes right out the window, a sealed enclosure will handle the power much better. As frequency drops the sub gobbles up much more power, it takes way more power to hit a 40 hz note with authority as it does a 80hz note. Yes this sub in a ported enclosure will wail, no doubt, but the sealed will yield better overall results. It is up to the user to decide.