Port Size - 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 03-28-2009, 08:55 PM
BassikInstincts's Avatar
Ω rise is way too high..
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss3784
Location: Northern Indiana
Age: 29
Thanks: 14
Thanked 11 Times in 10 Posts
iTrader: (18)
Feedback Score: 18 reviews
Default Port Size

I was hoping there was a thread stickied like this, but I see there is not. What is the calculation for tuning a port to something? Can someone help me out? What information do you need to tune it.
__________________
06 Chevy Malibu Maxx LT
empty trunk
DC Power 270xp


.... so far
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 03-29-2009, 05:54 PM
420guy's Avatar
CACO Canuck
 
Activity Longevity
0/20 20/20
Today Posts
0/11 ssssss251
Location: Brampton, Ont, Canada
Age: 52
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default

In for some learning as I am really confused how to calculate ports.
__________________
97 Cavalier dbDrag Street A - 142.7 @ 39hz

HU ~ Kenwood Excelon X-991
Front stage ~ Clarion SSS601 components
Subs ~ 2x Clarion SSW1001 10" D4
FS amp ~ Memphis 16-MC3004
Sub amp ~ Hifonics Brutus BXi2006D
Box ~ Tuned at 34.5hz separate chambers and common center slot port.
Deadening ~ B-Quiet extreme
Member #12 of CAAA

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message
  #3  
Old 03-29-2009, 10:23 PM
BassikInstincts's Avatar
Ω rise is way too high..
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss3784
Location: Northern Indiana
Age: 29
Thanks: 14
Thanked 11 Times in 10 Posts
iTrader: (18)
Feedback Score: 18 reviews
Default

bumpity, please? are slot ports different then tube ports for tuning?
__________________
06 Chevy Malibu Maxx LT
empty trunk
DC Power 270xp


.... so far
Reply With Quote Quick reply to this message
 
  #4  
Old 03-29-2009, 10:24 PM
Elite Member
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss6075
Location: Seattle
Thanks: 129
Thanked 148 Times in 88 Posts
iTrader: (11)
Feedback Score: 11 reviews
Default

Quote:
Originally Posted by Acidikbass20 View Post
bumpity, please? are slot ports different then tube ports for tuning?
Yes and no
Reply With Quote Quick reply to this message
  #5  
Old 03-29-2009, 10:25 PM
korey_hofer's Avatar
Elite Member
 
Activity Longevity
0/20 20/20
Today Posts
0/11 ssss33855
Location: willy wonka's sex dungeon
Thanks: 10
Thanked 965 Times in 748 Posts
iTrader: (11)
Feedback Score: 11 reviews
Default

Quote:
Originally Posted by terra View Post
Yes and no
yeah what he said you tune them the same way but to figure out the area it is different
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message
  #6  
Old 03-29-2009, 10:27 PM
BassikInstincts's Avatar
Ω rise is way too high..
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss3784
Location: Northern Indiana
Age: 29
Thanks: 14
Thanked 11 Times in 10 Posts
iTrader: (18)
Feedback Score: 18 reviews
Default

well, how do you figure out area in relation to tuning?
__________________
06 Chevy Malibu Maxx LT
empty trunk
DC Power 270xp


.... so far
Reply With Quote Quick reply to this message
  #7  
Old 03-29-2009, 10:27 PM
nismos14's Avatar
Super Moderators
 
Activity Longevity
2/20 20/20
Today Posts
0/11 ssss18241
Location: NJ
Age: 38
Thanks: 134
Thanked 152 Times in 117 Posts
iTrader: (64)
Feedback Score: 64 reviews
Default

Tuning a port:

4 types of tuning

A: 20-30 hz tuning is geared towards SQ

B: 31-35 hz tuning is geared towards SQL

C: 36 - 40 hz is on the brink of pure spl tuning but will typically yield decent sq with more spl.

D: 40hz + is generally for straight spl, and used with test tones going through the driver for competition purposes.

There are many good tuning calculators, some do NOT take into account sub displacement so be sure to calculate that.

Basic Car Audio Electronics has a good one located here:

The following links also helped me in choosing my port length.

Woofer Enclosures - Fraction to Decimal - Parallel - Series - Port Length and Volume Calculators

PORT Size Calculations and Formulas for WOOFER and Subwoofer BOXES (Scroll down on this site, there are two calculators)

There are also different types of ports

Slot ported, and round ports.

Slot ports tend to recduce the likelihood of port noise. They also tend to be larger boxes. Port tubes in an enclosure can be very finicky. It is a good idea to use aero ports with flared ends to avoid the issue of port noise.

With any Ported enclosure it is a very good idea to use subsonic filters at or SLIGHTLY below the tuning frequency.
Here's an example of why.... Say you have a 500 watt amp pushing a sub in a box tuned to 35 hz. Any frequencies that go through the driver below 35 hz can cause the driver to unload because below the tuning frequency there is less resistance to the motion of the driver and quite a bit less power handling. It is essentially a free-air driver below the tuning frequency. Therefore, if the driver has a low QTS, it is likely that even if the driver is rated for 500 rms, the mechanical limits will change when it is below tuning frequencies. In some cases you may be able to get away with it. So basically, just like a driver that is being used IB it would loose some of its power handling if it is not specifically made for IB use. The driver's ability to handle the full 500 watts is no longer true below the tuning frequency and you could very well destroy the woofer in that scenario.

Ported enclosures do require extra care in design and build as a ported box that is not built properly for a specific driver may cause damage to it.

Ported boxes tend to be much more efficient than sealed enclosures although this may not ALWAYS be the case. Above the tuning frequency the driver will also tend to handle more power.

The length of the port is crucial in determining the proper freq. The longer the port area/volume the lower the tuning would be. For instance in my application I have a 1.88 cu ft box with a port that is 15 inches this gives me a tuning of ~32 hz. A shorter port woud have given me a higher tuning freq. If it was 10 inches the tuning frequency would rise into the high 30's.
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

My Car, My Ears.

Quote:
if it was anyone besides nizzy i would agree. but he gave you the benefit of the doubt and only gave you a 5 pter when it should be considered a perma ban. nizzy isnt a nazi mod, hes one of the laid back ones. although i do not support all of the staffs decisions this is one staff that i do support 100%. just let it go and move on. it will expire
Reply With Quote Quick reply to this message
  #8  
Old 03-29-2009, 10:27 PM
nismos14's Avatar
Super Moderators
 
Activity Longevity
2/20 20/20
Today Posts
0/11 ssss18241
Location: NJ
Age: 38
Thanks: 134
Thanked 152 Times in 117 Posts
iTrader: (64)
Feedback Score: 64 reviews
Default

Thats my writeup.
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

My Car, My Ears.

Quote:
if it was anyone besides nizzy i would agree. but he gave you the benefit of the doubt and only gave you a 5 pter when it should be considered a perma ban. nizzy isnt a nazi mod, hes one of the laid back ones. although i do not support all of the staffs decisions this is one staff that i do support 100%. just let it go and move on. it will expire
Reply With Quote Quick reply to this message
  #9  
Old 03-29-2009, 10:35 PM
Elite Member
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss1560
Location: Washington originally from Iowa 98315
Age: 30
Thanks: 8
Thanked 0 Times in 0 Posts
iTrader: (12)
Feedback Score: 12 reviews
Default

Good writeup!
What do you think of tuning at 25hz?
Reply With Quote Quick reply to this message
  #10  
Old 03-29-2009, 10:42 PM
dak446's Avatar
Elite Member
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss5914
Location: Laramie, Wyoming
Thanks: 5
Thanked 7 Times in 7 Posts
iTrader: (7)
Feedback Score: 7 reviews
Default

its doable, but only w/ certain subs will u yield good results(ie: re xxx) and subs w/ low fs. why?
ps, good writeup nizzy!
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
What size fuse are you using? Patrick Simmons General Car Audio Discussion & Questions 29 03-19-2009 05:39 PM
What Box Size.. s Beatz General Car Audio Discussion & Questions 6 03-16-2009 02:39 AM
Sub/Size Suggestions. 350zkid General Car Audio Discussion & Questions 21 02-10-2009 09:03 AM
guess teh woofer size natisfynest Off Topic Chat 49 01-31-2009 04:52 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 06:13 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.