Enclosure fill Question
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=30058
Printed Date: May 17, 2024 at 3:52 PM
Topic: Enclosure fill Question
Posted By: One_Evil_Necro
Subject: Enclosure fill Question
Date Posted: April 09, 2004 at 2:40 PM
Some Sub manufactuers recommend using polyfill on all their enclosures, I thought that the biggest reason to run this fill was if you were using a box that was a little too small? Or should every enclosure contain some sort of poly etc in it? I have seen several say that even at correct specs to use like 50% fill, also how would I change the box specs to include this, or is this included in their calculations? ~Jay
Replies:
Posted By: stevdart
Date Posted: April 09, 2004 at 3:51 PM
I've seen the same things and it is a confusing issue. I read one manufacturer's manual last night that said to fill with 1 1/2 lbs per cu ft! I can barely fill with 1/2 lb without thinking it's too stuffed.
Posted By: DYohn
Date Posted: April 09, 2004 at 4:50 PM
It is confusing, especially since not all enclosures really NEED polyfill. I always use it, and always use 1lb per cuft. ------------- Support the12volt.com
Posted By: One_Evil_Necro
Date Posted: April 09, 2004 at 8:56 PM
Do I have to add any enclosure space to accomodate for the fill? Or is all that taken into account when they release the proper volume?
Posted By: Clean Install
Date Posted: April 09, 2004 at 10:28 PM
No just add filling and thats all....you dont have to increase the space because of adding filling ------------- If we learn from each success and
each failure, then we can improve ourselves
Posted By: haemphyst
Date Posted: April 10, 2004 at 12:11 AM
Strangely enough, a driver thinks it is an enclosure that is LARGER than it really is, but you can only fool the driver up to about +10%. (example: your box is one cube net, unstuffed and the driver will think it is a box that is 1.1 cube, after stuffing) The amount of stuffing you use to get this figure will depend on the stuffing material, and the original unstuffed volume of the box. Smaller boxes will take more stuffing per volume than a larger box. If you get to the +10% point, and you continue to add stuffing, you will actually start going back the other way. Also the ONLY way you can tell when you have reached that magical point is to TEST the driver in the enclosure, not with your ears, but electrically. It is difficult to say that you have gotten there by listening. Also, if you stuff a vented enclosure, (ideally, you never "stuff" a vented enclosure, you should just tack a thin layer of batting on the walls, for absorbtion of higher frequency energies) you need to make certain that the stuffing is nowhere near the inside mouth of the port... it'll jack with your tuning.
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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
Posted By: Clean Install
Date Posted: April 10, 2004 at 12:20 AM
nicely put...... ------------- If we learn from each success and
each failure, then we can improve ourselves
Posted By: One_Evil_Necro
Date Posted: April 10, 2004 at 3:11 AM
thanks
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