4th order 1/4wave t-line box for two 8in subs - 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 09-18-2013, 01:57 AM
CACO Member
 
Activity Longevity
0/20 15/20
Today Posts
0/11 ssssss340
Location: modesto, ca.
Thanks: 0
Thanked 3 Times in 3 Posts
iTrader: (6)
Feedback Score: 6 reviews
Default 4th order 1/4wave t-line box for two 8in subs

im wanting to make the most of two 8in on 600-800watts in a older volvo wagon.

i have a 6th order for a single dd1508 (@4ohms) on bout 150-200watts and it sounds and feeling amazing for the small power and small size of woofer.


so i wanted to make full use my my Crossfire BMF 600d amp to run at 1ohm


so im getting a pair of Massive audio hippo 8


so i thought to do a 4th order box just because i cant find the perimeter t/s of these subs so just to play it safe id tune it to 32-38hz and have the sealed chamber help the sub out.

or i wanted to do a 1/4wave t-line and tune to 35hz or so since the box is very efficient and will get low also.


so my thoughts were why not use both..
do a sealed to get lows and control the cone and do a 1/4wave t-line on top of it to efficiently hit the mid range (meaning 40-60hz lol).



this is just a quick sketch to show you what i mean
no measurements taken

i know will be somewhat big but remember i have a wagon.. i have space!!

so what my question really is....

if i dont have the t/s of the subs what should the tuning be?

and when finding the sqin port size for the 1/4wave t-line would the last tunnel being shared port have to be doubled in size? (width and depth and height?)
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 09-18-2013, 09:39 AM
666WMD's Avatar
No idea what I'm doing
 
Activity Longevity
0/20 16/20
Today Posts
0/11 sssss1307
Location: Transitional
Thanks: 108
Thanked 210 Times in 150 Posts
iTrader: (2)
Feedback Score: 2 reviews
Default

I'm a novice to t-lines so I could be wrong on this. I believe you would get tuning to 35hz by using the 1/4 wave theory. The shared port would indeed be simply the 2 single ports combined.
However I'm not sure how it would sound as putting the subs in a sealed box would change their Fs. Build and test I suppose.
Reply With Quote Quick reply to this message
  #3  
Old 09-18-2013, 05:24 PM
CACO Member
 
Activity Longevity
0/20 15/20
Today Posts
0/11 ssssss340
Location: modesto, ca.
Thanks: 0
Thanked 3 Times in 3 Posts
iTrader: (6)
Feedback Score: 6 reviews
Default

has anyone else tried this b4?
Reply With Quote Quick reply to this message
 
  #4  
Old 09-18-2013, 05:57 PM
KickinBlazer's Avatar
Elite Member
 
Activity Longevity
0/20 16/20
Today Posts
0/11 sssss1122
Location: memphis,TN
Age: 36
Thanks: 1
Thanked 50 Times in 50 Posts
iTrader: (11)
Feedback Score: 11 reviews
Default

no i dont believe anyone has tried it before....go ahead what would it hurt?
__________________
if its to loud your to old!
Reply With Quote Quick reply to this message
  #5  
Old 09-18-2013, 06:02 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

The proper way to use a transmission line is for increased bandwidth. Using it with a 4th order will basically give you a regular 4th order with a big port.
Transmission lines are not this magical spl box people think. 9/10 times a proper ported box will kill the t line on the meter. The t line is a sq box.
Reply With Quote Quick reply to this message
  #6  
Old 09-18-2013, 11:19 PM
CACO Member
 
Activity Longevity
0/20 15/20
Today Posts
0/11 ssssss340
Location: modesto, ca.
Thanks: 0
Thanked 3 Times in 3 Posts
iTrader: (6)
Feedback Score: 6 reviews
Default

so im better off just doing a t-line by itself?
Reply With Quote Quick reply to this message
  #7  
Old 09-19-2013, 09:43 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

no, a tline isn't a spl box.
the box you somewhat described in your op could be related back to a front loaded horn. You would of course need expansion on the line area to gain anything over a regular 4th order. It will be a huge box and it is not easy, nor free to design one.
__________________

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
  #8  
Old 09-19-2013, 10:00 PM
mega fatty
 
Activity Longevity
0/20 20/20
Today Posts
0/11 sssss6008
Location: milwaukee, wi
Age: 30
Thanks: 261
Thanked 326 Times in 303 Posts
iTrader: (15)
Feedback Score: 15 reviews
Default

Quote:
Originally Posted by korey_hofer View Post
no, a tline isn't a spl box.
the box you somewhat described in your op could be related back to a front loaded horn. You would of course need expansion on the line area to gain anything over a regular 4th order. It will be a huge box and it is not easy, nor free to design one.
From the couple folded horns I've messed with they were as small or smaller then their equal ported (with 8's)
I found the proper port area on the sa8's I used ended up making the port huge so the folded horn was about the same size.
The horn had similar output around tuning but the horn did pass it up in the higher frequencies.
I found the horn needed a loading wall though. If I opened my hatch playing below the tuning the subs would bottom, hatch closed all was fine

Op have korey do a horn for you I think you will be very pleased with it
__________________
07 mazdaspeed3
rd d9 @ .5ohm
2 sa Zv1's 5.8cf tuned to 48 or 32 with port plugs
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
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
4th order/T-Line HT design bigdhenderson General Home Audio/Video 23 02-10-2013 12:31 AM
crazy 4th order/t-line idea robman General Car Audio Discussion & Questions 3 01-09-2013 09:00 PM
T-line, 4th order, or Rear Loaded Horn? 813thumper Enclosure Discussion & Design Construction Help 9 11-17-2011 09:11 AM
12w7 in a 4th order or 6th order box for trunk kanoftuna Enclosure Discussion & Design Construction Help 10 09-01-2011 08:12 PM
Subs for 4th order box???? Oldbass38 General Car Audio Discussion & Questions 23 10-19-2010 08:01 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 05:32 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.