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View Full Version : To Polyfill or not to Polyfill? That is the question. 56K beware



skibumdc
04-25-2007, 12:53 PM
Say you build a fiberglass enclosure exact to subwoofer specs, do you still place polyfill in the box?

Usually people say to use polyfill to make a box appear bigger to a sub....but this is not the case for me.

Will the polyfill eliminate standing waves? EDIT: Read up and saw standign waves in this frequency range are not an issue

To use Polyfill or not to use Polyfill? That is the question.

I have an IDQ10 v.2 d4 BTW and here are two images of the box.
http://i149.photobucket.com/albums/s69/rudomat/topcarpeted.jpg
http://i149.photobucket.com/albums/s69/rudomat/sidecarpeted.jpg

newusername
04-25-2007, 03:32 PM
More info on polyfill that should help answer your question:

http://www.soundsolutionsaudio.com/forum/index.php?showtopic=7168

Max_Power
04-25-2007, 03:41 PM
More info on polyfill that should help answer your question:

http://www.soundsolutionsaudio.com/forum/index.php?showtopic=7168

wow, thats an awesome link..

PV Audio
04-26-2007, 11:38 PM
Polyfill does not do anything for standing waves, that isn't the point. What it does is slow the velocity of the air from the speaker, so that it takes longer to reach the enclosure itself, which is synonomous with a larger enclosure (further distance = more time and slower travel = more time).

Trey803
04-26-2007, 11:40 PM
Ive got a question......when building a fiberglass enlcosure that is molded to a corner like that. How do you know that internal volume of the enclosure?

Eugenics
04-26-2007, 11:44 PM
you could fill it with water

Famous_78
04-26-2007, 11:46 PM
you could fill it with water

agreed.

THUMPPER
04-26-2007, 11:52 PM
I use packing peanuts for getting the volume of
an odd shaped fiberglass enclosure

PV Audio
04-27-2007, 12:15 AM
^^ Beango. Measure the weight of a peanut, fill the thing with peanuts, weigh what you have at the end, and there you've got the weight of all of the peanuts. With that you can either roughly gauge the volume of a peanut and then divide to find how many peanuts you had in there, or find the volume of a peanut and then divide and get a more accurate number.

Twistid
04-27-2007, 12:18 AM
^^ Beango. Measure the weight of a peanut, fill the thing with peanuts, weigh what you have at the end, and there you've got the weight of all of the peanuts. With that you can either roughly gauge the volume of a peanut and then divide to find how many peanuts you had in there, or find the volume of a peanut and then divide and get a more accurate number.

or just use a 12x12x12 box :suicide:

baseballer1100
04-27-2007, 01:41 AM
^^ Beango. Measure the weight of a peanut, fill the thing with peanuts, weigh what you have at the end, and there you've got the weight of all of the peanuts. With that you can either roughly gauge the volume of a peanut and then divide to find how many peanuts you had in there, or find the volume of a peanut and then divide and get a more accurate number.

what is beango?

Rictamilk
04-27-2007, 01:45 AM
or you could use calculus :graduate:

PV Audio
04-27-2007, 07:10 PM
what is beango?
= Bingo :D

THUMPPER
04-27-2007, 07:48 PM
LMAO.....

I measure the packing peanuts in liters and
convert it into cf3...