View Full Version : Polyfill Question

06-22-2008, 09:49 PM
I just installed a new CVX 12" in a sealed box (I think it's 2.4^3... the guy at the shop messed up and built me a box for two subs instead of one, so I'm not sure if he still built it the size he told me at first...)

Anyway, I decided to try adding the pollyfill fiber to see how I liked it. But I'm not sure about a couple of things:

First off, I added one bag to the chamber of my box that's got the sub in it. The bag is 20oz (1.25 lbs) I've heard to use about a pound per cube. The CVX manual suggests filling the box 50%. But just this one bag seemed like a LOT in there. I actually pulled out a wad of it.

Here is why I think I've got a lot/too much: On the back of the sub there is a hole. I've heard blocking this hole will f up the sub. But it sticks into the box pretty far. I tried pushing most of the fiber to the side of the sub, trying to leave space behind it.

But I'm not sure how much clearance I need behind the subwoofer, if any. Or if the fiber could get drawn up into the hole. Or if heat from the thing could burn the fiber (I didn't check to see if it was flamable...)

Am I worrying about nothing?

Lastly, I wasn't sure if I should pull the fiber apart making it looser or if I should jam it in tight. From the way I understand it works, it seems looser would be better. If that's so then I think I would need to remove close to half of what's in there making for closer to 1/2lb of stuffing.

06-22-2008, 09:54 PM
your installer= Joke

06-22-2008, 10:02 PM
He's a good guy. It was a miscommunication. We got to talking and I told him I was probably going to put another 12 in later. Then it was almost a week between when we talked and when he built the box. Plus he had his helper take measurements in my truck. I guess he saw the big measurements (Tahoe) and he thought I meant I wanted the box build for two subs... I dunno.

Hey, I can't complain. I paid for one 2.4^3 sealed enclosure for a 12" CVX and got one built for two. Saves me having to get another one later if I need it.

06-23-2008, 02:03 AM
The box is already pushing the limit on the required sealed specs of that sub... Adding polyfil only makes it seem bigger....
... Don't add it.

06-23-2008, 05:53 PM
The box is already pushing the limit on the required sealed specs of that sub... Adding polyfil only makes it seem bigger....
... Don't add it.

Hmmm... the sealed specs are between 1.0cuft and 4.6cuft. I'm at 2.4 which is kind of in the middle so I don't know what you mean by "pushing the limit."

But I'll probably take the stuff out tonight and compare the sound tomorrow. If it's not that much different I'll just leave it out.

06-23-2008, 06:13 PM
I didn't think it was 4.6cuft for sealed max.
... Thought it was more like 3cuft. sealed max & 4.6 ported max...

.... NEVERMIND... I got them backwards.