PDA

View Full Version : How to calculate woofer displacement?



Reggie Lives
04-17-2008, 04:23 PM
Is there any easy method / online calculator to determine the woofer displacement of a particular woofer?

My sub didn't come with any specs execpt for the thiele/small parameters. I've done a bunch of online searches but only came up with two methods. Once was to dunk the sub in a bucket of water and determine how many liters of water was displaced. The other was an elaborate formula based off of the distance between the surround and the bottom of the magnet.

I tried the later, and came up with a figure of .27ft^3. Is that not fairly large for a 10" sub? The sub in question is a CSS SDX10.

Supergumby5000
04-17-2008, 04:45 PM
look up a subwoofer thats built similar to yours, and look at its spec sheet for displacement?

.27 seems pretty big for a 10

goonandbuck
04-17-2008, 04:46 PM
Is there any easy method / online calculator to determine the woofer displacement of a particular woofer?

My sub didn't come with any specs execpt for the thiele/small parameters. I've done a bunch of online searches but only came up with two methods. Once was to dunk the sub in a bucket of water and determine how many liters of water was displaced. The other was an elaborate formula based off of the distance between the surround and the bottom of the magnet.

I tried the later, and came up with a figure of .27ft^3. Is that not fairly large for a 10" sub? The sub in question is a CSS SDX10.

yea theres a real easy way........read the specs of the sub

edit: reading > me , i didnt read that you didnt have the specs

Supergumby5000
04-17-2008, 04:47 PM
yea theres a real easy way........read the specs of the sub

did you even read his post lol?

miker
04-17-2008, 05:13 PM
.027 would make more sense..

IDSkoT
04-17-2008, 05:20 PM
Uhh... google ftw :fyi:

Reggie Lives
04-17-2008, 05:34 PM
I'm checked google a few times, do you have a link to a site your referring to?

I checked JL's site, because they list the driver displacement of their subs. The mounting depth and magnet diameter of my sub fall roughly between the 10W3 (0.049cu.ft) and the 10W6 (0.068cu.ft). Would it be a safe bet to just use 0.05 as a arbitrary number?

Are there other factors involved in the driver displacment that I'm overlooking?

goonandbuck
04-17-2008, 05:36 PM
did you even read his post lol?

did you read my edit?

dman4486
04-17-2008, 05:37 PM
Once was to dunk the sub in a bucket of water and determine how many liters of water was displaced. The other was an elaborate formula based off of the distance between the surround and the bottom of the magnet.

I tried the later, and came up with a figure of .27ft^3. Is that not fairly large for a 10" sub? The sub in question is a CSS SDX10.

this is the best way

Reggie Lives
04-17-2008, 05:44 PM
this is the best way

Is it a common method? I can see the logic in it, but i'm hesitant to put my new $170 (I'm poor) electronic toy in water, and I don't trust plastic bags/seran wrap.

dman4486
04-17-2008, 05:46 PM
Is it a common method? I can see the logic in it, but i'm hesitant to put my new $170 (I'm poor) electronic toy in water, and I don't trust plastic bags/seran wrap.

LINK (http://en.wikipedia.org/wiki/Sarcasm)

ultimate157
04-17-2008, 05:50 PM
I would email CSS for the number. The SDX10 is a pretty big moofer.

Reggie Lives
04-17-2008, 05:53 PM
LINK (http://en.wikipedia.org/wiki/Sarcasm)

Haha, yeah, I thought you were being serious and felt I had to justify why I didn't want to do it. I've read a few places that it can be done, but yeah....I woudln't do that.

patrick1202
04-17-2008, 06:18 PM
my fi ssd is .17 which is a 15

Reggie Lives
04-17-2008, 07:23 PM
I would email CSS for the number. The SDX10 is a pretty big moofer.

I don't have an exact number but I'd say between 2 and 3 litres. It's really not that critical for this type of application. 16 oz stuffing is good.

Bob Reimer
Creative Sound Solutions



Just in case anyone was wondering.....so around .07 to .105 cu.ft.

Thanks for everyone's replies.