Vega124 Box size and tuning for HT - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 8th February 2006, 08:11 PM   #1
diyAudio Member
 
Join Date: Feb 2006
Location: Washington
Question Vega124 Box size and tuning for HT

Hello all... This is my first time here, I am new to HT subs and a have an old vega124 sitting around. I was hoping to put it to use in a budget HT setup... I appreciate any help.

Using WinISD for the first time this is what i came up with: (does it look ok?) I dont really know what I should be tuning forbut i figured 28hz would be a start in a 2.2 f^3 ported enclosure. I will be using a 240 watt dayton amp.

***Also, what things should i watch for when plotting enclosures, ie. what are important parameters. Sorry I am new to this. I also have a PPI 154 C2 sub that I was thinking of using in a 2 FT^3 sealed enclosure. I know Car subs are not the best choice for HT but i have them and why not put them to use until I can afford properly designed HT subwoofers. both subs will not be used in the same system.

Thanks,

Mark


Driver : Cerwin - Vega 124
Project by : me
Project for : you
--
Number of drivers : 1
Box type : Vented
Box size : 62.3 l
Tuning frequency : 30.00 Hz
Vent : 1 vent(s)
0.355 m length for each
0.102 m round


Relative
Freq Gain SPL
[Hz] [dB] [dB]
20.00 -14.83 99.97
25.00 -7.48 107.33
30.00 -2.60 112.20
35.00 -0.74 114.07
40.00 -0.45 114.35
45.00 -0.52 114.29
50.00 -0.60 114.20
55.00 -0.64 114.16
60.00 -0.65 114.15
65.00 -0.64 114.16
70.00 -0.61 114.19
75.00 -0.58 114.22
80.00 -0.55 114.25
85.00 -0.52 114.29
90.00 -0.48 114.32
95.00 -0.45 114.35
100.00 -0.42 114.38
  Reply With Quote
Old 8th February 2006, 08:35 PM   #2
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
Yes that looks pretty good for your application. Tuning at 30Hz you will need to make use of the high-pass (subsonic) filter found on most plate maps.

Car subs can be really good as well.

You need to check the excursion plot using WinISD Pro.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 10th February 2006, 06:38 AM   #3
diyAudio Member
 
Join Date: Feb 2006
Location: Washington
Excursion looks ok down into the low 20's. However I doubt they really move 19mm in a ported box. I figure they will be safe to about 12-14 mm at 22hz. Is that a fair assumption?
  Reply With Quote
Old 10th February 2006, 07:34 AM   #4
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
I'm not sure what you mean. If the sim in WinISD shows them moving to 19mm with your tuning and box size then that's what it will do unless you protect the drive unit with a filter.

In my experience 30Hz is at the very top end of tuning for a cinema subwoofer and you will see some massive cone excursions. I would strive to tune a bit lower and use a filter if it was me.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 10th February 2006, 10:37 PM   #5
diyAudio Member
 
Join Date: Feb 2006
Location: Washington
Should i be looking more towards 22-25hz. Also would that sound ok with music or should i stay high if i want to keep it musical too? Thanks for help!!!
  Reply With Quote
Old 10th February 2006, 10:59 PM   #6
diyAudio Member
 
Join Date: Feb 2006
Location: Washington
RE xmax comment above. CV claims these subs have a 19 xmax. I think thats in a sealed box. I was saying, I had assumed the excursion limits to be around 12-14 mm in a ported enclosure, which if true, keeps them safe down into the mid20's. Under 23hz they start moving ALOT +19mm
  Reply With Quote
Old 11th February 2006, 08:59 AM   #7
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
Yes more down towards the low 20s would give you better protection for HT. IMO the musicality of the sub is not directly dependent on the tuning frequency, rather the performance of the driver and box and vent system as a whole. It also depends what you mean by musical. Generally tuning lower will tend to tighten things up, some may like this, others may prefer a high impact sound.

The Xmax claims by the manufacturer are nothing at all to do with what box it is in, it is simply the limits the driver can move linearly. Do not assume anything about excursion in any enclosure! You must check the simulations.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 12th February 2006, 03:47 AM   #8
diyAudio Member
 
Join Date: Feb 2006
Location: Washington
Thanks, sounds good, I'll tune lower!

I did model the xmax; what I was trying to convey was when it got to 22-25 Hz it was between 12-14 mm. That is the reason I modeled the tuning and box in that manner. I did not want the driver to reach the claimed 19mm. Just trying to be safe...

Again, thanks for your time, help, and knowledge! Take care.

-Mark
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tuning at or below Fs tech.knockout Multi-Way 23 3rd February 2012 02:06 PM
Tuning BR below Fs? 00600 Subwoofers 28 11th November 2008 02:09 AM
Need help tuning PPI skooter Car Audio 5 21st January 2008 06:02 PM
Tuning Qes Qts Bl Mms P Zolt Multi-Way 10 21st April 2005 05:24 PM
Speaker size v Room size cliffy Multi-Way 6 19th February 2005 08:34 AM


New To Site? Need Help?

All times are GMT. The time now is 05:44 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2