So, i'm thinkin when i redo my interior, i'll upgrade my system. i've already got a new HU on hold and an amp already picked out. as of now, i've got a 08 model Kicker CompVR 12. the 2010's are the exact same specs, so i may upgrade to the 2010 model. Im needing a smaller box to put it in, because the box i have now is too big for where i have it. (opinions & suggestions are welcome)

 

My opinion about this is: You're going to have an awesome setup! My suggestion with this is: Take pictures!!

 

Why would you replace the same thing with the same thing but newer? Especially with the same specs. If you wanna waste money send it to me.
Just build yourself a new box or figure out what space you have and make sure your sub will like that airspace. Then there is always the fiberfill option to expand the box.

 

Don't you mean "fiberfill to REDUCE the box"? Since polyfil is a material with density, when you put it in a box, the displacement of the box decreases since the space is being taken up by something other than air.

 

It seems a little counter-intuitive, but it slows down the sound waves in the box... making the sub think its in a larger box and yields better low-end. I've used it with good results.

Loosely stuff it in the box, don't pack it in or put any behind the sub if it has a pole vent.

 

But in that case, a larger box would not give better low-end because there would be no compression, that would eventually go into the logic that a woofer in a sealed box will give better lows than a woofer in infinite baffle. According to the logic presented in your comment, there would eventually be a neutrality with stuffing the box in polyfil, since if you put in a little bit the subwoofer would htink it's in a larger box, until you put in some more then realistically the subwoofer is reacting to a smaller box. All polyfil does in a box when it's lined against the enclosure walls is help to "smooth" out the waves, usually resulting in a more controlled "thud" in bass. Other than that, adding any amount of polyfil will decrease the box's internal displacement, and a subwoofer will react as such.

 

poly fill is good..........Recommended in all sealed enclosures.

 

avoid kicker is my suggestion, id go w/ DC sound labs www.dcsoundlabs.com dont let the specs fool you, they are SEVERLY under rated, my buddy has a atomic 7k amp pushin 2 of the 18" xls and they take it like its nothin

 

So you're saying adding polyfill will increase the system Q and result in less low-end response? OK... I disagree and stand by what I posted earlier.

 

That's what I'm saying though, adding polyfil will increase low-end bass response. My last sentence said:

"adding any amount of polyfil will decrease the box's internal displacement, and a subwoofer will react as such."

My arguement is that adding any amount of polyfil will not give enclosure characteristics that the box displacement is increasing like you said and I quote...

"making the sub think its in a larger box and yields better low-end."

Because the logic that a larger box yields better low-end frequency response is the difference between a small sealed enclosure and infinite baffle, where the smaller sealed enclosure will have better low frequency response because of the compression created in such a small enclosure.

All I am saying, basically, is no subwoofer will think there is an increase in box space while having better low-end response by loosely stuffing polyfill against the box walls. Polyfill takes up space, and a woofer will always react as though box displacement has been lost, not gained.

 

Negative. The poly slows the waves down, that is why it acts as a bigger box. Your thinking sounds good, it just isnt correct in this matter.

 

Okay help me out cuz I've always been told differently and I've heard differently. In that case, where would be the point that using too much polyfil would indeed act as a smaller box? I mean, there should be a moment where the internal "actions" would be neitralized between bigger and smaller enclosure, you know what I mean? Would it be safe to conclude that the more poly that you use, the box would eventually act as free air?

Every time I've used polyfill, I have gotten characteristics of the box getting smaller, i.e. the bass response gets much tighter, and all I would do is spray glue on the walls throw a sparse patch of polyfill on it, and call it a day. The bass would sound more smoothe with the poly absorbing a bit of the compression, but it would still react as though the box was getting smaller, which indeed it was.

 

This would all depend on the sub and the size box you have. The fill makes it act like its a bigger box, but the sub would only benefit from it if the box is on the small size. If you have a box thats already too big then you make it 'act' bigger then you risk driving the sub with too much airspace.

Every instance is not going to be the same and will vary driver to driver and box size to box size.

 

Just loosly fill with fiber. Of course if you pack it tight then that would be decreasing.

 

Here's a good read on polyfill:

http://www.soundsolutionsaudio.com/f...ill-t7168.html