Jump to content

Photo

Speaker wadding


  • Please log in to reply
15 replies to this topic

#1 Dominic

Dominic

    Regular Forum User

  • Feedback: View
  • PipPipPip
  • 155 posts
  • Location:Nearish South london

Posted 07 Aug 2002 - 00:43

Just a quickie to see how much wadding people think should be in a sub enclosure.

I only put in a layer of 1 inch thick all around, but I'm sure the box has an "echo", so I'm assuming I need a bit more.

I can remember a few months ago, a magazine filling the box with fluff from a habadasherers shop, and I thought how does the sound get out. They must have gone over board surely with that much. <img border="0" title="" alt="[Eek!]" src="eek.gif" />
Blaupunkt London Skyline Headunit
Focal Polyflex 165H Components
JL 10w3-D2, wired 1Ohm
Efmax sealed twin chamber SQ+ box
Directed 600d Mono for sub
Phoenix Gold XS2200 for fronts

#2 MrMajestic

MrMajestic

    Royal Member

  • Feedback: View
  • PipPipPipPip
  • 2,118 posts
  • Location:Bristol

Posted 07 Aug 2002 - 01:49

I've seen a few installers just fill the box up with the stuff! It does trick the sub in thinking its in a bigger box than it is. The idea comes from home speakers which has been proven to work. Im gona just fill my next box up with the stuff when I get my new subs. Might just be worth experimenting a bit, see what you prefere. :)
Proof of intelligence on Mars is that they haven't tried to make contact with Earth!..

#3 Matt_82

Matt_82

    Regular Member

  • Feedback: View
  • PipPipPipPip
  • 1,960 posts
  • Location:Essex

Posted 07 Aug 2002 - 02:43

well the instructions from my kicker said that the box needed to be half filled with the stuff...... so thats what i did :P
Chicks Dig Scars, Glory Lasts Forever, There May Never Be Another Tommorow.

#4 HardAss Car Stereo

HardAss Car Stereo

    Registered User

  • Feedback: View
  • PipPip
  • 30 posts

Posted 07 Aug 2002 - 03:13

seal box with strength braces, does the trick... adding wadding, just alters the speakers/box parameters.. normally if the box is built to the T/S parameters of the speaker, no need for wadding.. if wadding is needed, usually find stuffing very small boxes, or just 3 internal faces, of a bigger box..

#5 nath

nath

    Trade User

  • Feedback: View
  • PipPipPipPipPip
  • 8,183 posts
  • Location:rotherham

Posted 07 Aug 2002 - 03:48

the material is called "dakron " and its available at most habadashers a good coating of around 2" on three faces is usually sufficient
all it does is trick the speaker into thinking its in a larger then average box because the airflow inside the box is slower than normal
"poke a bear with a stick only if you want to get bitten"

#6 Gav

Gav

    my ears bleed

  • Feedback: View
  • PipPipPip
  • 514 posts
  • Location:UK

Posted 07 Aug 2002 - 16:18

Is Darkon something I can get from B&Q? How much is it?

I paid £10 at my local ICE store for a meter square of 'sub box wadding' is this the same stuff?

#7 NEMESIS

NEMESIS

    Regular Forum User

  • Feedback: View
  • PipPipPip
  • 451 posts
  • Location:Notts

Posted 07 Aug 2002 - 16:27

I used to get a bin bag full for £10 from a market here in Nottingham. It looks like the insulation in sleeping bags & padded jackets. - White fluffy stuff.

When using make sure it is not too near the rear vent on the sub as i have seen a couple of subs trashed by this stuff being pulled into the sub through the rear vent!!!

:)
UK & Euro IDBL Record Holder 2003
NEMESIS
The Damn loud Blue Van :)

#8 Baz

Baz

    Why hello there sailor....

  • Feedback: View
  • PipPipPipPipPip
  • 8,435 posts
  • Location:Leicester or In a Mod :)

Posted 07 Aug 2002 - 16:53

BAF Wadding is another one commonly used - I have some of the stuff and its not that expensive either.

Theres place in south leicester that sells it.. although I havnt bought any for quite some time!!

Baz <img border="0" title="" alt="[Wink]" src="wink.gif" />
www.im-driving.co.uk

#9 Gav

Gav

    my ears bleed

  • Feedback: View
  • PipPipPip
  • 514 posts
  • Location:UK

Posted 07 Aug 2002 - 19:37

The stuff i have is a very compact weave so (hopefully) less likely to break away and **** up my sub.

#10 MrMajestic

MrMajestic

    Royal Member

  • Feedback: View
  • PipPipPipPip
  • 2,118 posts
  • Location:Bristol

Posted 07 Aug 2002 - 23:32

I think it also stops the sound waves from reflecting into the back of the sub which may effect the sound quality... they say your sub should never be parallel to the back because of the soundwave problem. :rolleyes:
Proof of intelligence on Mars is that they haven't tried to make contact with Earth!..

#11 dave364634

dave364634

    Regular Member

  • Feedback: View
  • PipPipPipPipPip
  • 16,234 posts
  • Location:north derbaashire

Posted 07 Aug 2002 - 23:43

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MrMajestic:
<strong>they say your sub should never be parallel to the back because of the soundwave problem. :rolleyes: </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">garrrr shit. :( :( :( :( :( <img border="0" title="" alt="[Frown]" src="frown.gif" />
I won't abuse my sig.

#12 Killahertz

Killahertz

    Just Do It

  • Feedback: View
  • PipPipPipPip
  • 3,463 posts
  • Location:Cheshire

Posted 08 Aug 2002 - 00:14

Build the box to the correct volume in the first place!. Wadding, depending on the type and level of fill, will lend the box an apparent increase in internal volume. However, the percentage increase in real terms is low, and the results of little audible value.

As for standing waves re the baffle and rear panel being parallel, not likely. At low bass frequencies standing waves do not form within the enclosure, well, unless your enclosure plays upto 100Hz, say, and the distance between parallel surfaces is about 3.5 metres! (1/2 wavelength relative to the frequency in question).
.

Confucius...Our glory is is not in never failing, but in getting up every time we do




Killahertz Acoustics


#13 pablo

pablo

    Regular Member

  • Feedback: View
  • PipPipPipPip
  • 4,239 posts
  • Location:Béal Feiriste

Posted 08 Aug 2002 - 00:14

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MrMajestic:
<strong>they say your sub should never be parallel to the back because of the soundwave problem. :rolleyes: </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I dont think thats true (although I have no evidence). The JL purist box design for my 15W6 suggests a rectangular box where the sub plane is parallel with the back. And I kinda trust JL :)

-pablo

#14 Madmax

Madmax

    Return of the Max

  • Feedback: View
  • PipPipPipPipPip
  • 25,553 posts
  • Location:Berkshire

Posted 08 Aug 2002 - 00:17

its a design theory which is true and holds. but all home speakers and PA speakers and a lot of car boxes ignore it and it isn't really noticable.

Your also not supposed to put the speaker in the centre of the baffle, it should be off to 1 side or corner, again i doubt you will hear the difference.
Dale

#15 MrMajestic

MrMajestic

    Royal Member

  • Feedback: View
  • PipPipPipPip
  • 2,118 posts
  • Location:Bristol

Posted 08 Aug 2002 - 00:23

Everyone tells you something different!!... Even the Bible contridicts itself!... <img border="0" title="" alt="[Frown]" src="frown.gif" />
Proof of intelligence on Mars is that they haven't tried to make contact with Earth!..

#16 Mouser

Mouser

    Regular Member

  • Feedback: View
  • PipPipPipPipPip
  • 8,047 posts

Posted 08 Aug 2002 - 04:25

MrMajestic... it's frequency dependent.

If a distance is less than the 1/8th wave it's a true pressure field. But in order for resonances to be significant you usually have the 1/2 wave distance... for subs.. or even mids in most cases... this is unlikely to occur.

Peaks in response can be due to all sorts of cancellations and resonances though, in a car we're faced with a myriad of problems to attack.

As K says build the box right in the first place.

The wadding will abosorb shuffing noises from the sub to some extent though, which in a ported box may be useful.

C
"I see nothing remarkable"
"On the contrary, you see everything. You fail, however, to reason from what you see"
Blade ICE