Fordmods Logo

Box filling 

 

Page 1 of 1 [ 8 posts ] 

 
 Post subject: Box filling
Posted: Tue Oct 10, 2006 12:39 am 
Getting Side Ways
Offline

Age: 31

Posts: 1679

Joined: 9th Jul 2005

Gallery: 8 images

Ride: BA XR6 TURBO

Location: Newcastle
NSW, Australia

is there any sorta stuff I should put inside the sub box? I was lookin at a walkthrough of someones boot install and they "cap filled" it or somethin, looked like foam.

any ideas?
Top
 Profile  
 
 
Posted: Tue Oct 10, 2006 1:24 am 
Getting Side Ways
Offline
User avatar

Age: 31

Posts: 4946

Joined: 15th Nov 2004

Gallery: 2 images

Ride: Trik'd up EFII XR6

Location: Perth
WA, Australia

If the box is sealed properly and is the correct volume or even slightly larger than whats recommended for your subs then no need for any internal fillings.

Only normally required if the capacity of your enclosure is smaller than whats recommended. And even then you honestly dont need it you will gain a lil more spl from it by adding like a fabric like dakron or expander foam..but just depends whether you really need it...

I'd make your boxes...seal all the edges with a good silicon glue or along those lines....and if its the correct size enclosure...leave it....if it smalls just buy some dakron...its cheap and no dramas to fit...

 

_________________

For Sale: 25 Farad Rockford Fosgate Competition Series Carbon Cap, more to come - pm me if interested

Top
 Profile  
 
 
Posted: Tue Oct 10, 2006 7:42 am 
Tyre Shredder
Offline

Age: 37

Posts: 383

Joined: 11th Aug 2006

Ride: 6.0L VE Calais-V

Location: Hastings
VIC, Australia

As Big Kev said, not really much point. I've tried many boxes with and without and heard no difference. But since I have heaps of it laying around already I chuck it in anyway, it can't hurt if you already have the stuff (dacron).
Top
 Profile  
 
 
Posted: Tue Oct 10, 2006 2:26 pm 
Tyre Shredder
Offline
User avatar

Age: 27

Posts: 315

Joined: 7th Oct 2006

Gallery: 3 images

Location: Bunbury
WA, Australia

wot about like this cotton wool stuff, i have heaps of it laying around does it really make that much diff ?

 

_________________

84 XF Falcon S Pak, 250 crossflow (rebuilt ~5000km ago, carby model), Bored out 30 thou, Crow racing cam, extractors, yokohama 245's all the way round, chrome 12 slotters, lowered, 4spd man, open wheeler (blew my lsd...), Thumping sound system, L.E.D's everywhere

Top
 Profile  
 
 
Posted: Tue Oct 10, 2006 2:55 pm 
Getting Side Ways
Offline
User avatar

Age: 31

Posts: 4946

Joined: 15th Nov 2004

Gallery: 2 images

Ride: Trik'd up EFII XR6

Location: Perth
WA, Australia

Busso wrote:
wot about like this cotton wool stuff, i have heaps of it laying around does it really make that much diff ?


well thats sorta like the dacron stuff...I havent noticed it make much difference except with big woofers like 12" and bigger in too small an enclosure...but even then to the ear it wasnt that great a diff....pays just to make the appropriate sized enclosure for your woofer in the first place....if you dont like that it requires too big a an enclosure or is gonna rob u too much boot space then dont go that bigger woofer or put it in a smaller enclosure and expect to get less performance out of it and not get ya moneys worth...in the end if ya dont like that a sub will require so much space spend the money on a quality woofer thats the next size down...

 

_________________

For Sale: 25 Farad Rockford Fosgate Competition Series Carbon Cap, more to come - pm me if interested

Top
 Profile  
 
 
Posted: Tue Oct 10, 2006 9:40 pm 
Fordmods Audio and Turbo Expert
Offline
User avatar

Age: 37

Posts: 2121

Joined: 14th Dec 2004

Ride: FG Turbo Territoty Ghia

Location: Traralgon
VIC, Australia

I dont believe it has any impact on the percieved size of the enclosure but i have found it reduces wooden ringing especially in boxes that are not carpet covered.

I alwayss pop it inside sealed boxes and often line te walls of poted boxes to reduce any wood ringing sounds.

Should only be $10

 

_________________


Pro Class
1st Super Tech - Summernats 2007
Australian SQ Champion - Am Show 2004
Australian SQ Champion – Pro Show 2006 & Best of Show
Ford Champion - Melbourne 2004 & 2006
451.5wkw - now SOLD

Top
 Profile  
 
 
Posted: Tue Oct 10, 2006 10:53 pm 
Getting Side Ways
Offline
User avatar

Age: 45

Posts: 582

Joined: 20th Nov 2004

Ride: xr6

Location: Brisbane
QLD, Australia

I did some experiments on this subject a few years ago using a sealed box, 3 jl10w6's wired to 4ohms, a series resistor, an osilloscope and a signal generator.
The theory is that by stuffing a box full of dacron or similar it gives the affect of a larger box, this in turn will affect the resonance of the system. When a speaker reaches resonance the impedance of the speaker will spike so by changing the box volume the resonant frequency (fs) will aslo change, as the box gets larger the fs will get lower in hz.
With the resistor in series it is a simple case of using the cro to measure how much voltage is dropped across the resistor, when the fs is reached the voltage will be at its lowest as there is less current being drawn therefor less voltage, simple ohms law.
So in my test I started with no fill and measure the fs and then with the box half filled measured it again and then with it full measured again. Each time the with extra stuffing the fs should fall according to the so called theory but the exact opposite occured it actually went up.
Make of that what you will.......

 

_________________

Do it once, Do it right!!!!!!

Top
 Profile  
 
 
Posted: Wed Oct 11, 2006 11:20 am 
Getting Side Ways
Offline
User avatar

Posts: 675

Joined: 19th Mar 2005

Gallery: 9 images

Location: Adelaide
SA, Australia

pyroay wrote:
I dont believe it has any impact on the percieved size of the enclosure but i have found it reduces wooden ringing especially in boxes that are not carpet covered.

I alwayss pop it inside sealed boxes and often line te walls of poted boxes to reduce any wood ringing sounds.


yep thats the sound i was getting with my single 12" a really loud wood ringing sound.. it sucked so i made my new box and linedit with some packing type foam all over the indside of the walls corrected that s**t sound i was getting

cheers
Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 1  [ 8 posts ] 

Who is online

Users browsing this forum: No registered users and 7 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Wed Dec 13, 2017 1:27 am All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names