How Does a Fibreglass Enclosure Work w/Sub Facing Inwards?

Home / the12volt's Install Bay / Car Audio / How Does a Fibreglass Enclosure Work w/Sub Facing Inwards? (

Topic Closed)

Welcome Guest :)

Members

Next Page > < Prev Topic Next Topic >

rhysem123

Member - Posts: 3

Joined: December 23, 2006

Location: Australia

Posted: December 23, 2006 at 5:31 PM / IP Logged

Hello all,

I was wondering how a fibreglass enclosure works when the sub is facing inwards. Is there a certain amount of room needed inside the enclosure? Is it less than a sealed rectangular enclosure?

If you do not know what kind of box i am talking about, this is quite similar.

How Does a Fibreglass Enclosure Work w/Sub Facing Inwards? -- posted image.

Thank you

djdowdell

Copper - Posts: 60

Joined: December 07, 2005

Location: Kentucky, United States

Posted: December 24, 2006 at 6:49 PM / IP Logged

It works the same as a woofer normally mounted. Sealed enclosures are pretty forgiving of miscalculations of sizes, up to 30% if I'm not mistaken, so just build it to the specs of the sub and it should work just fine. Go for it!

Pure Noize

jlord16

Silver - Posts: 322

Joined: September 08, 2005

Location: Australia

Posted: December 24, 2006 at 8:16 PM / IP Logged

Works exactly the same as a normally mounted sub, this is becuase when you have the woofer basket mounted outwards (inverted) you wire the sub backwards ( ie + becomes - and - becomes +). The airspace is simliar to that of a normal box but rember the sub dusnt displace any airspace like it would in a conventional box. Good to see another aussie on here

Clarion DB36MP

Infinity Kappa Perfect 10"

Respone 800w Mono

ALPINE MRP-F250

*Custom fabrications*

otto34

Member - Posts: 36

Joined: May 01, 2006

Posted: December 27, 2006 at 10:33 PM / IP Logged

I just got done with this one, this sub is going to be reverse mounted also.

How Does a Fibreglass Enclosure Work w/Sub Facing Inwards? -- posted image.

ricoshay

Copper - Posts: 67

Joined: March 23, 2006

Location: United States

Posted: December 29, 2006 at 12:14 PM / IP Logged

that mountng style is often used when enough air space isn't available. doen't make much difference in sound.

torquehead

Copper - Posts: 144

Joined: January 15, 2006

Location: United States

Posted: December 30, 2006 at 10:50 PM / IP Logged

The concept of the speaker working in that type of enclosure is all the same. When the cone/magnet end of the speaker is inside the enclosure, it takes away from the internal volume, which is the reason its a good idea to have the specs around when building an enclosure. So, if you poke the speakers rear end (magnet/basket) out of the enclosure, the enclosure can be smaller...a little. So, when the speaker is inverted like this, the cone actually contains air specific volume also. It should be figured as additional volume with the enclosure volume.

So now there is 2 ways of figuring: The enclosure can be smaller because it no longer contains the speaker magnet, basket, and the rear airspace of the cone. Additionally, the enclosure can be even a little smaller because the cone is reversed, which adds to the overall internal air volume....regardless of the type of enclosure.

djdowdell

Copper - Posts: 60

Joined: December 07, 2005

Location: Kentucky, United States

Posted: January 02, 2007 at 12:41 AM / IP Logged

otto34 wrote:

I just got done with this one, this sub is going to be reverse mounted also.

Oh......I see. From the first picture you posted I assumed you were using a sealed enclosure, but what you are building is a ported one so the 30% rule does not apply. Ported boxes are not as forgiving. I am not sure how far off you can be on a ported box...it depends on the tuning frequency you are shooting for, especially if you are going for spl or just an overall uniform sound. That brings in a lot of factors like roll of frequency, resonant frequncies of the interior and sub, etc.. If anyone can chime in with a more clear answer help me out, otherwise I gotta dig out my notes! How Does a Fibreglass Enclosure Work w/Sub Facing Inwards? -- posted image.

Pure Noize

otto34

Member - Posts: 36

Joined: May 01, 2006

Posted: January 04, 2007 at 2:00 PM / IP Logged

It was mainly to save room with the box, its going in an extended cab sonoma so I needed all the room I could get. And I am sure the dimensions on a ported box have to be damn near dead on for the box and the port rather than a sealed where you can be off a tad and it wont matter.....

domnic

Member - Posts: 1

Joined: December 03, 2006

Location: India

Posted: January 15, 2007 at 9:19 AM / IP Logged

hi guys

will anyone let me know is the sub encloser is only the fiber glass or is the mdf also in it is there any cal for the encloser

domant

crazyjim

Member - Posts: 5

Joined: January 05, 2007

Posted: January 15, 2007 at 1:02 PM / IP Logged

jlord16 wrote:

You're joking right? Are you telling someone to reverse the polarity of their sub?

Next Page >

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.