Building a 4th order. Need help with tuning - Car Audio Classifieds!
Car Audio Classifieds!  

Go Back   Car Audio Classifieds! > Enclosures, Fabrication & Sound Deadening > Enclosure Discussion & Design Construction Help

Enclosure Discussion & Design Construction Help Have questions about enclosure design neeed some help thoughout your build, ask here.


Notices

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-03-2013, 02:09 PM
CACO Member
 
Activity Longevity
0/20 12/20
Today Posts
0/11 ssssss256
Location: las vegas
Thanks: 0
Thanked 5 Times in 5 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default Building a 4th order. Need help with tuning

I am building a 4th order that is .5 sealed and 1.5 ported. How do I figure out how big my port will need to be to get it tuned to around 50hz?? Also how deep into the box will the port need to be placed? I want the top of the port rising out of the box at least 6-10 inches.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 07-03-2013, 06:29 PM
briankeith1007's Avatar
CACO Member
 
Activity Longevity
0/20 15/20
Today Posts
0/11 ssssss374
Location: Dumfries,Va.
Thanks: 16
Thanked 12 Times in 9 Posts
iTrader: (6)
Feedback Score: 6 reviews
Default Try this.

6inch port , 15 inches long.5 inches inside the box and 10 inches outside.
Reply With Quote Quick reply to this message
  #3  
Old 07-03-2013, 07:15 PM
CACO Member
 
Activity Longevity
0/20 12/20
Today Posts
0/11 ssssss256
Location: las vegas
Thanks: 0
Thanked 5 Times in 5 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default

Quote:
Originally Posted by briankeith1007 View Post
6inch port , 15 inches long.5 inches inside the box and 10 inches outside.
Six inch aero? Tube? Or square port?

I would like to go with a square port if possible
Reply With Quote Quick reply to this message
 
  #4  
Old 07-06-2013, 02:06 PM
CACO Member
 
Activity Longevity
0/20 12/20
Today Posts
0/11 ssssss256
Location: las vegas
Thanks: 0
Thanked 5 Times in 5 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default

okay the box will now be .4 sealed and 1 cuft ported after sub displacement. What will my port size (length, width, height) need to be to tune it to 50hz?? I will only have about 5 inches inside the box and 3-5 inches outside the box for port. So basically the port has to be 8-10 inches in total length.

Also how much displacement will the port have on the ported side?
Reply With Quote Quick reply to this message
  #5  
Old 07-06-2013, 04:03 PM
CACO Member
 
Activity Longevity
0/20 14/20
Today Posts
0/11 ssssss247
Location: 502
Thanks: 9
Thanked 29 Times in 26 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default

Where do you keep coming up with these numbers?

You can't just pick what you want the sealed and ported to be then make up a tuning frequency. It doesn't work like that. I'm not trying to be rude, just trying to help build something that will perform how you want. Making it up as you go along is not the way to go about it, especially on a bandpass. It a lot easier to screw up than a ported design.
Reply With Quote Quick reply to this message
  #6  
Old 07-06-2013, 04:11 PM
Elite Member
 
Activity Longevity
0/20 14/20
Today Posts
0/11 sssss1085
Location: WY
Thanks: 51
Thanked 164 Times in 129 Posts
iTrader: (23)
Feedback Score: 23 reviews
Default

Download winISD and try modeling your sub, it will give you a more realistic prediction for output and tell you what size vents are needed.
Reply With Quote Quick reply to this message
  #7  
Old 07-06-2013, 07:20 PM
CACO Member
 
Activity Longevity
0/20 12/20
Today Posts
0/11 ssssss256
Location: las vegas
Thanks: 0
Thanked 5 Times in 5 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default

Quote:
Originally Posted by dbsupra View Post
Where do you keep coming up with these numbers?

You can't just pick what you want the sealed and ported to be then make up a tuning frequency. It doesn't work like that. I'm not trying to be rude, just trying to help build something that will perform how you want. Making it up as you go along is not the way to go about it, especially on a bandpass. It a lot easier to screw up than a ported design.
I got these numbers from Taylorfade. I told him I am building a box for two sa8v2's. He suggested .4 sealed and 1 cuft ported tuned at 50hz.. He used this same box with the sa8v1.5 and said it worked great. I need a 4th order design for two sa8v2's. I have 17" in hieght 18 inch in depth and 40+" width to work with. If anyone wants to help me out with a design I would apprecitate it.
Reply With Quote Quick reply to this message
  #8  
Old 07-06-2013, 08:06 PM
CACO Member
 
Activity Longevity
0/20 14/20
Today Posts
0/11 ssssss247
Location: 502
Thanks: 9
Thanked 29 Times in 26 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default

Ok. It sounded like you were just picking numbers to fit what you had. If taylor already tried and designed this, what port area do you need? That will determine the length and if it will fit in your constraints.
Reply With Quote Quick reply to this message
  #9  
Old 07-06-2013, 09:33 PM
CACO Member
 
Activity Longevity
0/20 12/20
Today Posts
0/11 ssssss256
Location: las vegas
Thanks: 0
Thanked 5 Times in 5 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default

Quote:
Originally Posted by dbsupra View Post
Ok. It sounded like you were just picking numbers to fit what you had. If taylor already tried and designed this, what port area do you need? That will determine the length and if it will fit in your constraints.
I need 25 square inches. I have five inches to the motors inside the box and 7 " outside the box for port length.
Reply With Quote Quick reply to this message
  #10  
Old 07-14-2013, 11:40 PM
CACO Member
 
Activity Longevity
1/20 17/20
Today Posts
0/11 ssssss211
Location: Texas
Thanks: 3
Thanked 25 Times in 20 Posts
iTrader: (2)
Feedback Score: 2 reviews
Default

Quote:
Originally Posted by sbarber82 View Post
I need 25 square inches. I have five inches to the motors inside the box and 7 " outside the box for port length.

No offense, but you clearly don't understand how these things work.

You can't decide your tuning frequency AND port area AND port length! You have nothing left to "vary" since you've already fixed all the variables! Unless you are God, you cannot make a 1 ft³ box with 25 in² of port area and 12" of port length resonate at 50Hz. Im-fuggin-possible.

One or more things HAVE to give. So once and for all, decide which things are to give.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Car Audio Classifieds! forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Location
Where you live
Level of Car Audio Knowledge
What's your level of car audio?

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Building a wall and need help with variable tuning fritt Enclosure Discussion & Design Construction Help 0 01-14-2012 06:46 PM
Rules/guidelines/tips of building 4th order bandpass AFlem Enclosure Discussion & Design Construction Help 3 01-04-2012 02:12 PM
12w7 in a 4th order or 6th order box for trunk kanoftuna Enclosure Discussion & Design Construction Help 10 09-01-2011 08:12 PM
4th order tuning question treylittlefield Enclosure Discussion & Design Construction Help 5 08-07-2011 02:07 PM
using a box building program for Hz tuning slamnride Enclosure Discussion & Design Construction Help 6 09-24-2009 06:11 PM

» Amps
A/d/s/
Advent
Alphasonik
Alpine
American Bass
ARC Audio
Atomic
Audio Art
Audio Gods
Audiobahn
Audiocontrol
Audiopipe
Audison
Aura
Autotek
Avionixx
Bazooka
Beyma
Blaupunkt
Boss
Boston Acoustics
Bravox
Cadence
Cascade (CAE)
CDT Audio
Cerwin Vega
Clarion
Clif Designs
Concept
Coustic
Critical Mass
Crossfire
Crunch
DB Drive
DC Audio
DC Power
DEI
Denon
Diabolo
Diamond
Digital Designs
Directed
DLS
Dual
DYnamat
Dynaudio
Earthquake
Eclipse
Elemental Designs
ESX
Eton
Farenheit
Fi Car Audio
Fix My Speaker
Focal
Fusion
Genesis
Ground Zero
Hafler
Helix
Hertz
Hifonics
Hushmat
Image Dynamics
Infinity
Interfire
JBL
Jensen
JL Audio
JVC
Kenwood
Kicker
Knu Konceptz
Kole Audio
Kove Audio
Lanzar
Lightning Audio
Linear Power
MA Audio
Magnat
Marantz
Massive Audio
MB Quart
McIntosh
Memphis
Metra
MMATS
Mobile Authority
Morel
MTX
Nakamichi
Niche Audio
O2 Audio
Ohio Generator
Optima
Orion
Oxygen Audio
OZ Audio
PG Audio
Phase Linear
Phoenix Gold
Pioneer
Polk
Power Acoustik
Powerbass
Powermaster
Precision Power
Profile
Pyle
Pyramid
RadioShack
Rainbow
Rampage
RE AUdio
Rockford Fosgate
Scanspeak
Scosche
Seas
Sony
soundstream
Sparkomatic
SPL Dynamics
Stinger
Sundown Audio
Swiss Audio
Targa
TC Sounds
TREO Engineering
TRU
Tsunami
Ultimate
US Acoustics
US Amps
Velodyne
Vifa
Viper
Visonik
Xtant
Zapco
Zed Audio
Powered by vBadvanced CMPS v3.2.3
Links
Amp Guts
amplifier, amp guts, ampguts, car audio classifieds, speakers and subs for sale with listings of 12 volt sound systems. Security systems for sale for aftermarket car audio equipment with amplifier and amps for sale
Car Audio Forum
car audio forum, moble audio, car stereo, wholesale car audio, 12 volt, with, amplifier, amp, subwoofer, sound quality, buy car audio, and sell automotive stereo systems for cars
Car Audio Sound Quality Forum
Sound QUality science based car audio forum, amplifier, subs and speaker design, fabrication help, sound systems forum, aftermarket car audio website for sound quality.
Car Stereo Forum
DIYMA car audio stereo forum for 12 volt car audio subwoofer and amplifier systems that have sound quality with wholesale car audio products.


All times are GMT -5. The time now is 06:46 AM.


Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.0
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.