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FRD File Creation for PCD7 FuzzMeasure SMAART SPL Trace
FRD File Creation for PCD7 FuzzMeasure SMAART SPL Trace
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Old 15th July 2014, 01:42 AM   #1
G Speakers is offline G Speakers  United States
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Default FRD File Creation for PCD7 FuzzMeasure SMAART SPL Trace

Hey everyone. I'm having a hard time formatting my SPL data into a FRD file that PCD7 can read. I have lots of ways to get the SPL data, but so far only SPL Trace data successfully gets imported. Fuzz measure even exports FRD that appears formatted correctly but just doesn't load. Is there some mystery secret? Thanks.
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Old 15th July 2014, 04:01 AM   #2
Inductor is offline Inductor  Portugal
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Link your file(s) here as a .txt so that other members can look at it.
(Don't forget to change back the files to .frd/.zma names terminations)
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Old 15th July 2014, 12:58 PM   #3
G Speakers is offline G Speakers  United States
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Default Sample FRD file

Here is a sample that was sent to me by the creator of FuzzMeasure. I'm pretty sure I tried deleting the comment lines before adding to PCD as well. Anyone have any luck here? I feel like other people have FRD issues too, but no one has great solutions.


FuzzMeasure Sample.txt
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File Type: txt FuzzMeasure Sample.txt (31.6 KB, 20 views)
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Old 15th July 2014, 01:38 PM   #4
Lojzek is offline Lojzek  Croatia
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The first three values in following order Freq,Mag, Phase are
10.044153 -22.462917 -305.321167.

When you delete the word line and change the extension from
txt to frd, it can't be seen in PCD because on Y axis the values range
from 30 to 110 dB, and you have -22,46.
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Old 15th July 2014, 03:18 PM   #5
G Speakers is offline G Speakers  United States
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Well that makes a lot of sense.

It seems like a lot of people know and use PCD so where are their FRD files coming from?
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Old 15th July 2014, 03:46 PM   #6
Lojzek is offline Lojzek  Croatia
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wolf_teeth posted a couple of times the following link:

https://app.box.com/s/qa3g6ukzxp6410dwmcrv

I know I make my own frd's and zma's measuring drivers in the box.
It helps me understand what kind of passive parts values should I be
hoping for if I wanted to build it.

Last edited by Lojzek; 15th July 2014 at 03:56 PM.
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Old 15th July 2014, 05:07 PM   #7
jReave is offline jReave  Canada
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For the purposes of simulation, I use SplTrace for all of my initial frequency and impedance curves. Doesn't take me more than 3 or 4 minutes per curve to get the job done but there are a few things you do to make your life easier:

1 - Be flexible with the lower frequency that you start the trace at. If you are going to splice on the box response at 150Hz or 200Hz anyways, it doesn't make much sense to start tracing at 20Hz, does it? Same applies to impedance curves depending on if and how you are manipulating them.

2 - Also be flexible with the number of points you use to make the tracings. You don't really need to use 400 data points for a fairly smooth response in other words. So I might use 50 for a partial impedance response, 100 for a full one, 100 or 150 for a partial and smooth frequency response and 300 or 350 for a full and very detailed one. Hit Trace in the upper left, click on Options, select "Use Trace Limits:" and then fill in accordingly.

3 - I don't think very many other people are still using this, but I like to use the Frequency Response Combiner to manipulate these files after tracing because it let's me resample a tiny frd file into as many points as I want to make it and because it also lets me extrapolate a curve from only a small number of data points (particularly useful for tweeters as I only need to trace a little bit of its roll-off slope and then extrapolate the rest). Needs Excel though and the learning curve is a little steep.

But if you are using measurements, you shouldn't have to worry about any of this. I'm using REW for measurements at the moment but they are saved as .txt files so I still need to rename them with an .frd file ending. You might want to give that one a try.
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Old 15th July 2014, 09:39 PM   #8
G Speakers is offline G Speakers  United States
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^ jReave - Thanks for the great info! A few questions:

1 - splicing the low-end in. Can you be specific about your process here? Does this mean that you aren't taking your full range measurement with the driver in the box but taking 2 separate measurements and splicing them together? Also, what is your hardware setup for measuring impedance? I have software that can do it but don't understand how to physically get the signal in.

2 - I agree with you totally

3 - Think I get that

So are you saying that with REW you take a measurement with mic/interface, then just change the extension to FRD and it works in PCD? It sounds too good to be true. Are you opening the txt file in a program and saving as a FRD? Or straight changing the extension without opening? Thanks again for the help here.
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Old 15th July 2014, 11:49 PM   #9
jReave is offline jReave  Canada
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G-man,

Steps 1, 2 and 3 above are for the purposes of simulation only. Typically you take the simulated box response and splice it on to the infinite baffle response (ie. the manufacturer's curve) and then add in the simulated baffle response and then extract minimum phase. But measuring obviates the need for all of that as it is all included intrinsically in the measurement. Well almost - there is a small problem with pseudo-anechoic measurements below about 200Hz. This might help you more than I can in this regard - New-Paper-available-on-How-to-Get-Accurate-Measurements-Indoors-Down-to-10-Hz.

This may also come in handy for determining your z-offsets in PCD once you import the measurements - How-to-use-OmniMic-and-PCD-to-find-the-Relative-Acoustic-Offset&highlight=acoustic+offset.

I have lots of experience with simulations but as it is I am just now getting into the whole measurement thing so I'm currently waiting for the next version of DATS to measure impedance, but there are other ways of doing it. Others may be able to help you with that more than I can. But yes, with REW you simply have to change the file extension without opening it (just using the 'Rename' function) and then it imports fine into PCD. Maybe there's another way around that that I haven't discovered yet but as it is, it's a pretty simple change to make.
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Old 16th July 2014, 12:47 AM   #10
G Speakers is offline G Speakers  United States
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jReave, thanks again. So a possible example for a short route from "nothing" to "start of simulation":

1: decide driver configuration and pick appropriate drivers
2: establish desired Vb/Ports, etc
3: build cabinet, install drivers, take SPL, phase, and Z measurements
4: PCD time

Does REW also measure phase? Do I need to make changes to the measured phase before adding to PCD? Why is manufacturer phase data not usable?
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