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Old 3rd December 2006, 07:06 PM   #1
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Question FRD/ZMA Problem

Hi,

I just introduced myself to frd and zma files, because I'm planning to make my own simple 2-way speaker.

I downloaded "Passice crossover designer 5.10" which seems like a easy to use program. I tried to Load the sample FRD files to the program and it works perfectly.

Then I downloaded SPL Tracer program, and tried to make my own FRD files. I made all the required alignments and made the file by selecting the correct points.
The probles is, that when I load this file to the crossover designer, it doesn't work correctly.

This what the response looks like :
http://personal.fimnet.fi/private/clan/response.jpg

These are the first three lines of the FRD I made with SPL Tracer:

20 77,91209 0
20,63071 78,24176 0
21,28132 78,50549 0

And these lines are from a working sample file:

10 29.4903 -28.5158
10.1517 29.499 -28.4475
10.3056 30.0283 -28.0261

I tried to do another frd file with another speaker response with no better results.

Am I doing something wrong or isn't SPL Tracer and the passive crossover designer just not compatible?
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Old 3rd December 2006, 07:34 PM   #2
claudio is offline claudio  Italy
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The format is the classic Frequency - Amplitude - Phase.
The problem is that your file uses , for decimal, while the sample file uses . as for decimal: change your file "," with "." and you should be set.
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Old 3rd December 2006, 08:46 PM   #3
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Thanks for your reply.

There is 400 tracepoints and if I have to change both frequency and amplitude decimal symbols to a ".", which makes 800 corrections.

Is there a way to do this with somekind of text editor?

Or is there a alternative for the SPL Tracer?

(In the FRD the SPL Tracer generates the Phase is set to 0 at every frequency, is this a problem?)
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Old 3rd December 2006, 08:56 PM   #4
claudio is offline claudio  Italy
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It's very easy to do:
open the file with Win NOTEPAD, then MODIFY/SUBSTITUTE and write "," in FIND and "." in SUBSTITUTE WITH; the click on "substitute all" and the job is done.

The phase always at 0 will mean you are not considering the phase, so it's not useful for crossover design.
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Old 3rd December 2006, 10:02 PM   #5
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Quote:
Originally posted by claudio
It's very easy to do:
open the file with Win NOTEPAD, then MODIFY/SUBSTITUTE and write "," in FIND and "." in SUBSTITUTE WITH; the click on "substitute all" and the job is done.
Well that was almost too easy, but I wasn't aware of that function Thank you.

Quote:
The phase always at 0 will mean you are not considering the phase, so it's not useful for crossover design.
I believe I should read this through and I try to understand something
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Old 4th December 2006, 01:19 PM   #6
claudio is offline claudio  Italy
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Quote:
Originally posted by Twisted85

I believe I should read this through and I try to understand something
In RBJ example, the result is within 2 dB from the measured response: even if the 2 dB difference can't be taken as a general rule, it's a big value, in my opinion.
The FR Combiner allows you to calculate the minimum phase starting from the frequency response: in my Home Page I show this procedure as well, starting from a measured response.
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