Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: what kind of box is good for this subs with vent holes or enclosed thank u
Document: If you're looking for some loud subwoofers, these are the kind to get. Mine run on a 1000watt amp and kick really really hard, an I've heard lots of subs and been in lots of cars with subs, and these are definitely top 3 on my list of best subwoofers I've ever heard. If you have a vented box, it makes them louder, just saying!! Great subs. I wish there were more than 5 stars to show my appreciation of the subs.
They are (2) 1200 watts not (2) 2400 watts but i need the kick in my car because i like it loud... kind of disappointed but still hitting heavy good buy for the price
These subs are great, they handle very good, very sensitive if you like music clean and no distortion, I got em in a sealed box 1.75 Cubic feet and they hit hard... bass is deep and loud, can be too much sometimes but i think i may try these with ported box,, or a smaller sealed box.
I have never written a review for a sub before, but these were so good that I have to do it. I have to that I got last summer, and was running them off of a 1200w ssl amp in a sealed box. I maxed out the amp to full gain and these subs were still bangin, so I bought a 2500w amp and have it set to around 60% gain, and they haven't blown or seized up, and still sound great.
This is an amazing sub. I got two of these in the back of my avalon, and these slam. I have them in a double ported box with a thousand watt kenwood amp and it is tearing my car apart. Also its good quality bass and isn't lacking on quantity. Don't be fooled by the price, these are probably the best low dollar subs, but you can't believe it till you hear it, so I suggest dropping by a local audio store to hear these beauties in person.
I bought these along with an enclosed box (that fit the specific space requirements) and was skeptical only because of how cheap they were. But after hooking them up to my Kenwood x-997 HU and putting my Kenwood 1800  class D Mono amp and tweaking all the settings.. They blow me away! You can literally feel your hair moving when you turn them up.. I keep it on -7DB and it goes up to +15DB so you can imagine what they're capable of.
They sound good out of the box, but once their broke in you will be amazed. 2 of these make good "hood" sound, 3 or more and your competition ready.
Bought 1 of these from amazon and put it in a sealed .75 Atrend box, and this little sub pounds for what I paid. I have a cheap Boss 400wpc amp hooked up to this speaker. If you are on a limited budget like most folks these days, then this is a good buy. Im waiting till payday to order 2 more for my caddy.. Good Job Kenwood!
Havent taken out of box yet. they get 2 stars for fast delivery but im rather pissed about this add. ordered a pair of 2400 watt / 800 rms speakers as described. showed up today and they are not close. each speaker is 1200 watt/ 400 rms for a conbined total of what they claimed each speaker is. what i thought was a good deal turned into a purchase i cant use unless i want to blow them.
I had purchased these subs about a month ago. They came a day or 2 later then they said but besides that I can't complain. These are a great deal for the price, and they bump hard! I have them hooked up with a kenwood amp I had also purchased off this site and a box that I had built myself. I your looking to be the loudest ride on the road this is it.
Answer: They hit harder with an enclosed box and sounds more clear if filled with polyfill