need some help on changing tune - 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 04-14-2017, 04:19 PM
caloriu's Avatar
Elite Member
 
Activity Longevity
0/20 15/20
Today Posts
0/11 sssss2863
Location: IL
Thanks: 102
Thanked 169 Times in 133 Posts
iTrader: (107)
Feedback Score: 107 reviews
Default need some help on changing port area

im new to enclosure design we are trying to figure out what works best for the crossfire c7-12's . manufacture recommends 2.25 net per driver with 11 sq in of port or so and that simply wont work for my build.

plan is 8-12's on 4 sq 4500.1 amps . the test box is 2 cube net per and iirc 15 sq in of port box does a solid 153 on 5k which i can deal with but subs get warm quick on clean power so i want to drop a little port area

i have heard you can add wood in the port to decrease but does the wood need to be as deep as the port baffle or can i get away with simply adding sort peices ?
__________________
[

Last edited by caloriu; 04-14-2017 at 06:50 PM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 04-14-2017, 05:34 PM
Elite Member
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss4405
Location: N. Alabama
Thanks: 296
Thanked 674 Times in 524 Posts
iTrader: (9)
Feedback Score: 9 reviews
Default

Whatever you add should probably extend the length of the port. Just sticking a random piece of wood in the port will probably show a decrease in tuning simply because of the added resistance to the port air plug movement, but it will also hurt port efficiency and will be entirely unpredictable.

Also keep in mind that reducing port area will make the port less efficient and lowering tuning will do the same, so I would expect a lower score on the meter. Less efficient ports will get you more cone movement though so it might help a tiny bit with cooling, but I doubt it will be more than a degree of difference.
Reply With Quote Quick reply to this message
  #3  
Old 04-14-2017, 06:48 PM
caloriu's Avatar
Elite Member
 
Activity Longevity
0/20 15/20
Today Posts
0/11 sssss2863
Location: IL
Thanks: 102
Thanked 169 Times in 133 Posts
iTrader: (107)
Feedback Score: 107 reviews
Default

Quote:
Originally Posted by SPLEclipse View Post
Whatever you add should probably extend the length of the port. Just sticking a random piece of wood in the port will probably show a decrease in tuning simply because of the added resistance to the port air plug movement, but it will also hurt port efficiency and will be entirely unpredictable.

Also keep in mind that reducing port area will make the port less efficient and lowering tuning will do the same, so I would expect a lower score on the meter. Less efficient ports will get you more cone movement though so it might help a tiny bit with cooling, but I doubt it will be more than a degree of difference.

im sorry the way i phrased it above was not what i meant im fine with the tune i just wanted to follow manufacture suggestions that subs have way too much port area . it peaks at 40 hz and is great for daily music wise i just wanted to drop port area down as instructed.

i have heard of guys claiming to add wood in the port to shrink i just did not know how its done. i was not just going to throw a random piece it i was thinking going from 46.5 wide port to 45 .

again this is simply for testing
__________________
[

Last edited by caloriu; 04-14-2017 at 06:51 PM.
Reply With Quote Quick reply to this message
 
  #4  
Old 04-14-2017, 10:34 PM
Elite Member
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss4405
Location: N. Alabama
Thanks: 296
Thanked 674 Times in 524 Posts
iTrader: (9)
Feedback Score: 9 reviews
Default

Gotcha. I see what you're saying- just slide in a piece to reduce the width. As long as the piece you slide in is the same length as the port that will lower tuning like you want.
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
changing the plans - when is enough enough brian84corvette Off Topic Chat 3 08-08-2014 08:02 PM
changing font. btsteinb Off Topic Chat 3 04-02-2013 08:47 PM
changing subs Blaza33 General Car Audio Discussion & Questions 21 03-28-2013 06:17 AM
I am SO changing my major. F3M4 Academic Section 3 03-25-2010 07:17 PM
Changing pulleys crownvicon26's General Car Audio Discussion & Questions 8 12-30-2009 08:23 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 09:02 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.