long round ports in small enclosures - Car Audio Classifieds!
Car Audio Classifieds!  

Go Back   Car Audio Classifieds! > Vendors > Direct Sound Solutions


Notices

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 02-04-2015, 08:39 PM
CACO Member
 
Activity Longevity
0/20 12/20
Today Posts
0/11 ssssss285
Location: Louisiana
Thanks: 22
Thanked 68 Times in 47 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default long round ports in small enclosures

Below is an explanation on how DSS gets a 37.25 inch long round port in a box 24 inches deep without using elbows.

For this demonstration I'm using a 6 inch round port with a external diameter of 6.5 inches and a internal surface area of 28.25 inches.

Steps involved for calculating port.

1. How far away to make the end of the port form the back wall. (No it's not the diameter of the port). The port area is 28.25 inches so we need the area between the port end and back wall equal or a tad more than the port area. So surface area of a cylinder is...

area = (2pi x radius) x height

since we know the area...

28.25 = (6.28 x 3) x height
1.49= height (distance from port end and back wall)

Next a port extension is needed with an ID that will create a surface area of 28.25 inches between the port and the port extension. I use sketch-up as it takes much less time than doing it by hand. In this case a port extension with a 9 inch ID works well.

Finally the port extension length is calculated like any other slot port extension to create the needed 37.25 inches of total port length.

[IMG][/IMG]
Reply With Quote Quick reply to this message
The Following 2 Users Say Thank You to Quentin Jarrell For This Useful Post:
craiggus365 (02-21-2015), Todd Dupler (02-26-2015)
Sponsored Links
Advertisement
 
  #2  
Old 02-04-2015, 08:43 PM
Elite Member
 
Activity Longevity
0/20 11/20
Today Posts
0/11 sssss1882
Location: Hiram, georgia
Thanks: 282
Thanked 138 Times in 127 Posts
iTrader: (9)
Feedback Score: 9 reviews
Default

I'm laughing so hard right now. I don't know why I never saw it this way.

That being said I'm still trying to figure out slot ports. Where the corners are I have no idea how to calculate that in the length. So how would you figure this in a aero-slot port?
Reply With Quote Quick reply to this message
  #3  
Old 02-04-2015, 08:57 PM
CACO Member
 
Activity Longevity
0/20 12/20
Today Posts
0/11 ssssss285
Location: Louisiana
Thanks: 22
Thanked 68 Times in 47 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default

Quote:
Originally Posted by southernbass View Post
I'm laughing so hard right now. I don't know why I never saw it this way.

That being said I'm still trying to figure out slot ports. Where the corners are I have no idea how to calculate that in the length. So how would you figure this in a aero-slot port?
Port length is calculated by an imaginary line in the center of the width of the port. So just draw a line between the port walls and measure snaking around all the way to the end. Effective port length of a flared end varies depending on the rate of the flare but most of the time the point 1/2 the distance from the throat and mouth is used. So if you lay a flare on a table with the throat (the part that mounts to the port) on the table and measure it's "depth" and its 6 inches then the flare effectively adds three inches of length to the port.
Reply With Quote Quick reply to this message
 
  #4  
Old 02-04-2015, 09:04 PM
Elite Member
 
Activity Longevity
0/20 11/20
Today Posts
0/11 sssss1882
Location: Hiram, georgia
Thanks: 282
Thanked 138 Times in 127 Posts
iTrader: (9)
Feedback Score: 9 reviews
Default

Well I had planned on using some PVC and home making my port/flare. If I did it this way, let's say I start with 20". I flare about 1.5" lip on it to mount to my box. At this point its still 20"? Sorry I'm a visual learner. Imagining it isn't doing too well at the moment.
Reply With Quote Quick reply to this message
  #5  
Old 02-05-2015, 06:02 AM
TaylorFade's Avatar
SPL Retard
 
Activity Longevity
0/20 18/20
Today Posts
0/11 ssss12327
Location: Louisiana
Thanks: 265
Thanked 2,855 Times in 1,641 Posts
iTrader: (67)
Feedback Score: 67 reviews
Default

I've actually used this concept before.

Ben trying to visualize an easier/cleaner way to make the transition between them.

Like the bottom half of this at the transition. If you can visualize that.
Attached Images
File Type: jpg lens.jpg (18.8 KB, 79 views)
__________________
4x world champ
4x world record holder

Quote:
Welcome to the world of SPL.

Where nothing makes any fucking sense.
Quote:
Music and movies are art. Audio is a science.
- Floyd E. Toole
Reply With Quote Quick reply to this message
  #6  
Old 02-05-2015, 11:37 AM
CACO Member
 
Activity Longevity
0/20 16/20
Today Posts
0/11 ssssss416
Location: Il
Thanks: 3
Thanked 83 Times in 71 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default

Polk Audio came up with this concept in the mid 90's. There is actaully software available to model them as well. Google Polk power port and you can find some good resources, there are even some new commerical designs that utilize these as well as some DIY guides for making them.
Reply With Quote Quick reply to this message
  #7  
Old 02-05-2015, 11:40 AM
New CACO Member
 
Activity Longevity
0/20 9/20
Today Posts
0/11 sssssss32
Location: Baltimore, md
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader: (0)
Feedback Score: 0 reviews
Default

So how do you calculate the displacement of the port??
Reply With Quote Quick reply to this message
  #8  
Old 02-05-2015, 12:38 PM
CACO Member
 
Activity Longevity
0/20 12/20
Today Posts
0/11 ssssss285
Location: Louisiana
Thanks: 22
Thanked 68 Times in 47 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default

Quote:
Originally Posted by T3mpest View Post
Polk Audio came up with this concept in the mid 90's. There is actaully software available to model them as well. Google Polk power port and you can find some good resources, there are even some new commerical designs that utilize these as well as some DIY guides for making them.
The Power Port is not a port extension. It is a guide to couple the port to the baffle of the enclosure.
Reply With Quote Quick reply to this message
  #9  
Old 02-05-2015, 12:39 PM
CACO Member
 
Activity Longevity
0/20 12/20
Today Posts
0/11 ssssss285
Location: Louisiana
Thanks: 22
Thanked 68 Times in 47 Posts
iTrader: (1)
Feedback Score: 1 reviews
Default

Quote:
Originally Posted by Coh33dkill3r View Post
So how do you calculate the displacement of the port??
Volume = 3.14 x radius^2 x height.
Reply With Quote Quick reply to this message
  #10  
Old 02-05-2015, 01:32 PM
New CACO Member
 
Activity Longevity
0/20 9/20
Today Posts
0/11 sssssss32
Location: Baltimore, md
Thanks: 0
Thanked 0 Times in 0 Posts
iTrader: (0)
Feedback Score: 0 reviews
Default

So for example you picture. You would calculate the 6" displacement and the 9" displacement then add them together correct?
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
Question about round ports. dangeranger2008 General Car Audio Discussion & Questions 4 10-06-2012 02:58 PM
Please post pics of enclosures using 6" ports. jstjst General Car Audio Discussion & Questions 5 08-12-2011 05:13 PM
Who makes huge aero (round) ports? jt_buck General Car Audio Discussion & Questions 6 04-11-2011 06:09 AM
how you use round ports? MERQUE General Car Audio Discussion & Questions 2 04-05-2011 09:33 AM
3 round 10" ports jj53913 Enclosure Discussion & Design Construction Help 10 05-19-2009 10:27 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 03:53 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.