These are the 7 tests (3 or on the Impedance tab) I have planned at this point, although I plan for more output choices on the Impedance test.
I’m not sure what you’re looking for, but… if you’re looking for frequency response that’s on the tab that says Impedance. Switch the ComboBox called Results type in that tab to Response to do a Frequency response test.
Steps to perform the export and import?
Sure. Run an impedance or gain or response sweep and when it finishes the Export button in the upper right will highlight - as available.
To export as FRD click the Export button when the sweep is done. If you export an impedance it’s best to save as ZMA, which gets automatically identified as impedance, but FRD is ok for your purposes and it can still be imported as impedance in REW.
REW import is in the File menu and by default will import an FRD as SPLs and a ZMA as impedance (ohms,phase). Each import is another saved waveform. If you view “All Spl” in the graph you’ll see them overlayed.
I did a real quick video to show the steps… → https://youtu.be/ypBmBGj14eE
After watching the video : ) I noticed that the exported phase and amp are being double-converted (oops). I’ve fixed it for the next release which is now available. Proving why it’s time to have testers 
M
Thank you for doing this. Much appreciated!
Hopefully you’ll continue to develop this software.
At this stage the software is mainly for me which means that I’m fairly comfortable with the current functionality, since it lets me test conventional stereo equipment thoroughly and design loudspeakers - my desired usages.
With that said, if a suggestion has a pile of value I will implement it. Any bug reports are always welcome and will be handled, hopefully quickly but…
Things I plan to do imminently (in decreasing priority order)
a) Finish rearranging rewording setting entry GUI
b) Get the input/output generator options working reliably and intuitively. Maybe include spectrum and IMD.
c) Check and repair any of the summary displays. IMD is particularly wrong. Support right channel for them also.
d) Improve the cursor-marker display in-graph and data display
e) More error handling for bad entries and similar
Mark
Link :Github Release Link
Hi @MarkZ ,
thanks a lot for this great piece of software! I use it very often, esp. frequency response.
Some issues from my point of view:
If I click on “Fit to data” on the right side, nothing happens. I have to fit it manual entering the values in the corresponding fields. Doing this f.e. from -180 to -20, there is shown a 0 too much, which I have to delete every time again. It is not overwriting the whole existing value.
Also there are strange values for the impedance in the field settings, 5, 8, 10 and 20 ohms are not very usual. and the prog doesn’t remember changes there.
An own site for frequency response like in older versions would be great.
Little things, thanks a lot again, Mark!
Hi,
Yes, Fit to data isn’t there yet, sorry. It’s, as far as I know, the last totally unimplemented feature.
I’ll see if I can fix the manual entry thing you’re seeing, though it may just be the way those controls work. There’s no underlying code there at the moment.
The values in the lists are just starting values since you can manually edit the entry and I thought they were ok. What would you think are better default impedance selections?
Don’t forget that you can save your current settings to a default file (QADefault) that gets used at startup - which will remember your values. I could automatically save your current settings on exit but a lot of people (like me) don’t like that. Maybe I’ll add that option to settings?
I’m not sure what you mean by “own site for frequency response”. If you meant the old code, which used chirp and had pretty bandwidth lines - I agree that’s just not done yet. The code works for response but it’s slower albeit more precise.
I would like to add back in the old quicker/smoother chirp method if that’s what you’re asking for. I’ve been working on a user-programmed chirp to restrict the frequency range but not having much luck at that so I may just give up and go back to the factory chirp as an option (not what I was hoping for but it’s good for quick response tests and impedance tests).
Thanks for the feedback.
Mark
Hi Matt,
thanks for the quick response.
Values for impedance 2, 4, 8 and 16 ohm are more practicable, I think.
Whith site I mean the riders for choosing the measurements.
Thanks.
By the way, you were right - there was a bug not loading the new Settings tab values (oops) so AmplifierLoad was not being loaded. Fixed for next release…and thanks for the bug report.
-Mark
Ok, there’s a new release with save fixed and at least a rough pass at Fit to data buttons. -Mark
I used the most time REW with an Soundcard earlier and it works fine, so i am firm with that aplication. (for Speaker building the most Time)
I wish the REW Programmer would build an Hardwaresupport for the Q403 Series Devices to Control them in Software on REW. 
More and more People use the Q403 already.
That i would like a lot. (let me a dreaming…LOL)
I know there are the Asio Drivers Out and i am used it already but this is only an Compromise to get it running, and this is good already.
Thanks MarkZ, youre Software looks already nice too, will test it soon
I use REW a lot but agree that the ASIO driver just doesn’t provide enough control. That’s much of the reason I ended up looking at Joost’s program.
QA40xPlot is modeled after REW in a number of ways (like the summary popup info) and has very nice/full hardware support. Kind of the GUI simplicity of REW with more functionality than the factory QA40x application.
You may like it. It’s simple to install/run to try it out.
A couple of notes:
Mark
btw thanks to @Matt for #1 - which required knowing how to REST a user signal
Thanks, Mark! If you know the issue with the zeros it‘s no problem. Just wondering.
Hi, i am not an Softwaredeveloper but there ist an REW API thats is REST(ish) with webhooks
You are using this ? QA403 has also REST Commands right.
So probably this way REW could have Hardware support to QA403 Device?
There is an ASIO driver for the QA403 that goes direct to USB and works with REW. I’ve used it and it’s fine and very usable. But, it has no control over the attenuator (it’s a startup configuration setting) and the voltage display isn’t absolute and it doesn’t support an external generator. So, it works but isn’t great.
What I like about Joost’s original app and now Qa40xPlot is the ability to control the hardware dynamically so
Following as this is a super interesting thread.
Hey Blueglow
I’ve seen your things on YouTube, welcome! I’m doing valve stuff too, mainly for guitar.
Hi Matt,
I get some weird results with your software measuring an EBS Classic 450.
If I use the chirp preset of the QA40x-Software, I get this:
Settings: Smoothing 2, generator output level 0,1V, 20 - 20.000 Hz, 48kHz, FFT 32
Yellow: Speaker output at 4 Ohm
Red: Line Out signal, both after the flat EQ.
Using your software (response), I get this:
Whats that? Lack of smoothing?
The graphs shown in the QA40x-software of exactly this measurement look like this:
Any hints?
