Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 9th November 2005, 12:56 PM   #1
diyAudio Member
 
Join Date: Mar 2004
Location: At the output stage
Send a message via Yahoo to mr_push_pull
Default Freeware (or usable demo/trial) acoustical measurement software? (other that SW!)

Hi everyone

Let's assume one can't get along with SW, reasons irrelevant.
Any serious alternative for MLS measurement? Free, usable demo/trial, of course.
  Reply With Quote
Old 9th November 2005, 01:01 PM   #2
diyAudio Member
 
Join Date: Jun 2004
Location: Italy
Sample Champion: http://purebits.com/

Many info are in the application notes section:
http://purebits.com/appnotes.html

The trial is fully usable for real measurements for 30 days.

Feel free to ask me technical questions about it or MLS method..

Bye,
Paolo
  Reply With Quote
Old 9th November 2005, 01:21 PM   #3
diyAudio Member
 
Join Date: Mar 2004
Location: At the output stage
Send a message via Yahoo to mr_push_pull
Quote:
Originally posted by paologatto
Sample Champion: http://purebits.com/

Many info are in the application notes section:
http://purebits.com/appnotes.html
Thanks for the quick reply. I hope the demo doesn't have any limitation as upper frequency limit or the like.

Quote:
Originally posted by paologatto
[B]Feel free to ask me technical questions about it or MLS method../B]
Be sure I will
  Reply With Quote
Old 9th November 2005, 01:44 PM   #4
diyAudio Member
 
Join Date: Jun 2004
Location: Italy
The demo has some limitations.. or what demo is?

But you can do almost all kinds of measurements..
Note that SC, differently from some other software, has a slow learning curve because has a lot of features and options (and requires some basic knowledge in what you are doing). On the other side this makes it very powerful and flexible.
So don't give up if you don't obtain perfect results after 5 minutes of use..

bye,
Paolo
  Reply With Quote
Old 9th November 2005, 01:49 PM   #5
diyAudio Member
 
Join Date: Mar 2004
Location: At the output stage
Send a message via Yahoo to mr_push_pull
All I need to do is measure the frequency response of drivers. With the aid of the app notes I hope the learning won't be so painful.
  Reply With Quote
Old 9th November 2005, 02:37 PM   #6
diyAudio Member
 
Join Date: Oct 2005
Hi Paolo,

Is there anything online that explains exactly how an MLS measurement works? For instance, once the impulse response is known, how is the frequency reponse determined? I used to be an electrical engineer and would like to know the mathemathics involved.

Thank you.

Bob
  Reply With Quote
Old 9th November 2005, 02:39 PM   #7
diyAudio Member
 
Join Date: Mar 2004
Location: At the output stage
Send a message via Yahoo to mr_push_pull
Quote:
Originally posted by ctviggen
Hi Paolo,

Is there anything online that explains exactly how an MLS measurement works? For instance, once the impulse response is known, how is the frequency reponse determined? I used to be an electrical engineer and would like to know the mathemathics involved.

Thank you.

Bob

I second that question. Once I thought about writing a very basic MSL measurement SW (yes I'm serious), but never took the time to get into the theory involved.
  Reply With Quote
Old 9th November 2005, 03:04 PM   #8
diyAudio Member
 
Join Date: Oct 2005
Well, I think if you took an FFT of the impulse response, you'd get a frequency response. That makes sense. And that's why you want to select the portion of impulse response prior to the echo to get the response of the speaker and not the room. Hmmm...this software is a bit more powerful than ETF, which I have, as ETF is only for room response (i.e., you can't select a portion of the impulse response). I think that theory and reality are probably different, though -- for instance, do you just add all the frequency components from each window? That's probably what you do.
  Reply With Quote
Old 9th November 2005, 03:09 PM   #9
diyAudio Member
 
Join Date: Jun 2004
Location: Italy
Quote:
Originally posted by ctviggen
Hi Paolo,

Is there anything online that explains exactly how an MLS measurement works? For instance, once the impulse response is known, how is the frequency reponse determined? I used to be an electrical engineer and would like to know the mathemathics involved.

Thank you.

Bob

On my website there are some very basic explanations: http://purebits.com/mlsteo.html

About the relation of the frequency response to impulse response (one is the FFT of the other for linear stationary systems), the theory is not strictly related to MLS but to linear systems.

For advanced info about MLS I suggest to read JAES papers from D.Rife, the first that applied practically MLS to audio measurements. He developed the MLSSA system.
Also papers by Schroeder, Vanderkooy, Vorlander and Mommertz are very interesting. Some Bibliography: http://purebits.com/bibliog.html
  Reply With Quote
Old 9th November 2005, 06:42 PM   #10
diyAudio Member
 
Join Date: Oct 2005
Thank you! Now, I just have to find those articles.
  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
Sound Card Based Audio Test & Measurement System, 21-day fully functional Free Trial! VIRTINS Vendor's Bazaar 43 29th July 2011 03:10 PM
limits on freeware PCB design software akis Parts 7 21st August 2009 03:25 PM
Praxis-audio messurement software-free demo Solve Multi-Way 0 20th March 2008 10:48 AM
freeware design software anli Multi-Way 7 6th June 2005 06:50 PM
Speaker Design Software Demo dbaudio Swap Meet 0 10th September 2004 01:12 PM


New To Site? Need Help?

All times are GMT. The time now is 09:28 PM.


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