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Old 3rd August 2006, 09:15 AM   #1
ux226 is offline ux226  Denmark
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Question Speaker measurement, FRD and ZMA

Hello.

I have this reasonably decent measurement setup:

ESI Juli@ sound card (24bit/192KHz full duplex)
Behringer ECM8000 Mic
Behringer UB802 Mixer/Preamp
TrueRTA 1/24th octave software
audioTester software

and that all works pretty good.

What I need to do at this moment is to measure some speaker units in their actual enclosures and produce FRD and ZMA files that I will then use to simulate x-overs. I need the files to contain both amplitude(dB or ohms) and phase.

How do I get around that? I'm am all open for yet another piece of software if need be. I just hope it won't cost me too much
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Old 3rd August 2006, 12:54 PM   #2
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Speaker Workshop will let you create FRD and ZMA files from measurements, it will also do the simulations for you and best of all it's free

http://www.audua.com/
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Old 3rd August 2006, 02:22 PM   #3
ux226 is offline ux226  Denmark
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Thanks a lot.
I just downloaded it and installed it on my laptop... Exploring the software should keep me occupied in the train on my way home from work today ;-)
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Old 3rd August 2006, 03:09 PM   #4
Calvin is online now Calvin  Germany
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Hi,

depending on the software You can ´fudge and cheat´ a bit.
The .frd and .zma files are just a text files with the first column containing the amplitude values and the second column containing the phase values. A lot of software outputs its data the same or a similar way.
Just open the data files with the editor and have a look! If there is a headline..just delete it. Save the files then as standard text-file with the proper ending.

Example:
DLSA generates .amp and .imp files that look like this:

for a file "drivername.imp"

"Freq[Hz] Imp[Ohm] Phas[Deg]"
12.5 3.1 5.3
25.0 3.1 5.2
37.5 3.1 5.7
and so on

the "drivername.zma" file would look like this:

12.5 3.1 5.3
25.0 3.1 5.2
37.5 3.1 5.7
and so on

So apart from the missing headline and the different file ending they are the same!

jauu
Calvin
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Old 3rd August 2006, 03:19 PM   #5
hongrn is offline hongrn  United States
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Hello ux226,

Instead of Audio Tester and TrueRTA, use Arta. Arta measures frequency response, phase, impedance, and will allow you to export to zma and frd. Good luck.

Hong
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Old 3rd August 2006, 03:43 PM   #6
Calvin is online now Calvin  Germany
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Hi,

uuups a correction:

The format is three columns not just two

First: Frequency
Second: Amplitude value
Third: Phase value

jauu
Calvin
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Old 3rd August 2006, 05:48 PM   #7
ux226 is offline ux226  Denmark
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I spent the time in the train home from work reading the entire Help file of Audua Speaker Workshop. It seems to be able to do all I need.

I have downloaded and looked at the program several times before, but every time I found it to be so non-intuitive to use that I dumped it again. After reading the Help file from start to finish and navigating the interface a bit I believe I'll get the hang of it. It seems like a very powerful package once you get familiar with it.

I think Speaker Workshop will be one of my primary development tools from now on. TrueRTA is however so good at measurements of complete systems from the listening spot that I will never regret that purchase.

I had a brief look at Arta just now, and I think I'll see how far Speaker Workshop gets me before spending time (and eventually money) on that. Thanks a lot for the pointer though - that's one program I had never seen before.

Now, please have me excused - I have a bunch of experiements to do!
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Old 3rd August 2006, 10:12 PM   #8
JMB is offline JMB  United States
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If you are interested in a really good tutorial, go to Claudio Negro's home page at www.ClaudioNegro.com. If you then want to delve further, I have put together a fairly comprehensive manual that you could download there. In addition to SW information, it has a slew of spreadsheets and general audio information that may be of interest to you. It is a large file, however.

Good Luck,

Jay
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Old 4th August 2006, 06:27 AM   #9
ux226 is offline ux226  Denmark
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Wow. I'm impressed!

I just read the TOC and first 4-5 pages of your manual Jay, and I look forward to reading the rest of it. Great work!

For once I'm actually happy that I travel 1h30m each way for work by train... Gives me the time to read stuff like this.

Thanks
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Old 4th August 2006, 11:52 AM   #10
JMB is offline JMB  United States
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Thanks. I hope that you have time to evaluate the spreadsheets and helper programs, as well. I believe that they are quite helpful and educational. I have put together a few others since the second edition. I am currently in the process of compiling all of the notes I have taken and several new spreadsheets into this Manual. I don't know that I will post it as the size is getting to be quite large, however, I will be watching for questions on the boards and will share what I have gathered or put together as appropriate. I am not an expert but a very obsessive learner.

Jay
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