How do I know what kind of amp and the watts needed for the new subs?

Ported will have more output. Just about any box you find online or at best buy, etc is a prefab. You want a custom built box to your subs recommendations to get the most out of your subs without damaging them.

 
What do you mean by "prefab" box? I thought you said ported will be better? Also I don't have any space (I don't live in a house) to make my own box. I'm honestly not running on a lot of trunk space either, and I don't think the height of a 15" in a box will fit under the ceiling of my trunk. I own a 2003 Mitsubishi Lancer.
prefab, cookie cutter, premade, mass produced, aka china factory boxes with china quality wood. You'd always want a box designed to maximize the loudness and performance out of your subwoofer. The difference between a prefab and a custom box would be, prefab would shake your rearview mirror a little bit, Custom would make it fall and would also rattle your car apart. dont let me get started on the sound quality comparisons @_@. http://www.caraudio.com/forums/high-output-enclosures/535560-high-output-enclosures-picture-log.html look around in this thread, you'll see what a real enclosure should look like.

ThatChevyGuy suggested a 15 which would be facing up here's an example of a 500 rms 15 inch sub in a custom enclosure facing up, it takes as much space as 2 12s


 

---------- Post added at 04:54 AM ---------- Previous post was at 04:54 AM ----------

 

sorry for the bad vocal quality the vid was recorded on my old POS android

 
Ported will have more output. Just about any box you find online or at best buy, etc is a prefab. You want a custom built box to your subs recommendations to get the most out of your subs without damaging them.
But guys do I need them? Isn't it wicked hard to make your own box? I'm not as excited to do that as I said I don't have the space to build my own box. Will the ported box deliver louder bass in comparison to my 1 polk sub? Because I'm pretty impressed with it right now nd that's prefab nd ported. I know you guys want to give me the fullest potential for my sub(s) but I don't think it's gonna be convenient.
I'm not trying to blow my doors off the car but just wanted to know if I could use those subs with my amp and if they will sound better then my previous setup. Thanks for the fast replies again btw.

 
i'd say just keep your current amp and sub unless you really really REALLY crave for a ton more bass. Little upgrades like this arent really worth your money.
I agree with this guy, those subs are fine with that amp.... try it out, if you want more sell your current stuff on ebay and then get more...

 
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