the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

porting a box


Post ReplyPost New Topic
< Prev Topic Next Topic >
cody2white 
Member - Posts: 20
Member spacespace
Joined: January 16, 2008
Location: United Kingdom
Posted: May 16, 2008 at 1:35 AM / IP Logged  
hey guys, i decided to build a ported box for my 2 12 alpine x's. i have winisd and i understand it, i just dont get what frequence to tune it at or making the response flat. why do i want it flat as possible? wouldnt i want the extra 3db at 38hz or something? i dont get it well any info will help thanks
sedate 
Silver - Posts: 1,173
Silver spacespace
Joined: July 03, 2004
Location: Colorado, United States
Posted: May 16, 2008 at 1:45 AM / IP Logged  

Its not really going to be "flat" per se - it'll still be a curve.

Personnally, I define "flat" as +/- 3db from 30 - 80hz.

So from 30hz up to 80hz, the frequency should stay within 3 db at the same input power.  Make sense?

I would start your tune @ about 33hz and see what that looks like.  Box size should be ~2.75 - 4cft.  Bigger is almost always better - but ur vehicle and how much weight you want to add are important considerations.

"I'm finished!" - Daniel Plainview
aznboi3644 
Gold - Posts: 2,600
Gold spaceThis member consistently provides reliable informationspace
Joined: May 01, 2006
Location: United States
Posted: May 16, 2008 at 2:26 AM / IP Logged  
flat on WinISD won't be flat in-vehicle response with eq'ing. Transfer function/ cabin gain
DYohn 
Moderator - Posts: 10,741
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: May 16, 2008 at 10:00 AM / IP Logged  
Plus, one of the beauties of using a program like WinISD is if you want or need +3db @ 38Hz, you can design an enclosure that will give you that.
Support the12volt.com
cody2white 
Member - Posts: 20
Member spacespace
Joined: January 16, 2008
Location: United Kingdom
Posted: May 16, 2008 at 2:53 PM / IP Logged  
ohhh i get it, haha thanks guys! when you guys talk about eq do you mean use something like this? would something like this help?
sedate 
Silver - Posts: 1,173
Silver spacespace
Joined: July 03, 2004
Location: Colorado, United States
Posted: May 16, 2008 at 4:09 PM / IP Logged  

No.  That's a line driver - it amplifies your pre-amp frequencies if for some reason your head unit can't get ur amp to full output. 

They really aren't that useful unless you like injecting lots of bass into things that don't have alot of it.  Audiophiles tend to shun them.

I think these guys make the best EQ's and xovers on the market:

http://www.mobileaudiocontrol.com/

"I'm finished!" - Daniel Plainview
tubbs04 
Copper - Posts: 212
Copper spacespace
Joined: March 31, 2007
Location: United States
Posted: May 16, 2008 at 6:27 PM / IP Logged  
I just bought an audiocontrol 4xs! It's a pretty neat little machine!
...don't crush the weasel...
cody2white 
Member - Posts: 20
Member spacespace
Joined: January 16, 2008
Location: United Kingdom
Posted: May 18, 2008 at 9:11 PM / IP Logged  
hmm. i still bought it anyway haha i wanna see how it will sound and what makes it tick. i have a really noob question but i need some help. what is the best way to attach fleece to a project. i herd start from the middle ( the subs ring) and work your way around or  i herd left to right. i tried the left to right and failed miserably. it keeps wanting to overlap each other, how do the professionals do it?
haemphyst 
Platinum - Posts: 5,054
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: May 19, 2008 at 9:37 AM / IP Logged  
<dave shakes his head in utter disgust and unbelieving sadness>
I cannot believe what has happened to Soundstream. What was once one of the finest manufacturers of audio gear for the car, (bar VERY few) is now flea-market... Anybody ELSE remember the "Class A 50"? You'd've NEVER bought one of those from "SonicElectronx". That linked piece looks like something STRAIGHT from the swap-meet. What a chunk of... well, let's just say we can safely label it a "splashlog". (As in - FLUSH IT!)
So few truly good car audio companies, anymore...
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Sorry, you can NOT post a reply.
This topic is closed.

  Printable version Printable version Post ReplyPost New Topic
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 Follow the12volt.com on Facebook
Thursday, October 31, 2024 • Copyright © 1999-2024 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
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.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer