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QuantAsylum QA400 and QA401
QuantAsylum QA400 and QA401
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Old 20th December 2014, 12:26 PM   #1561
Max Headroom is offline Max Headroom  Australia
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Old 20th December 2014, 06:38 PM   #1562
SyncTronX is offline SyncTronX  United States
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Originally Posted by Max Headroom View Post
Thanks Dan. : )

That's what I meant.
Fingers didn't cooperate.
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Old 27th December 2014, 06:20 AM   #1563
cwtim01 is offline cwtim01  Hong Kong
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Is there a way to automate the QA400 to obtain a THD+N vs Freq plot (maybe by some kind of scripts)?

I can't find such function in the GUI and it's very tedious to obtain such plots manually (by adjusting the freq manually, write down the figures and then plot them in Excel).
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Old 16th February 2015, 07:05 PM   #1564
zmix is offline zmix  United States
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I'd like to use the interface with some OSX based software, are there any special drivers needed to use it in OSX?
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Old 16th February 2015, 09:18 PM   #1565
richiem is offline richiem  United States
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AFAIK, QA400 is Windows only.
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Old 26th February 2015, 06:58 PM   #1566
MuddJester is offline MuddJester  United States
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I've been drooling over the QA400 for a number of months now for electronics measurement, but then I realized that it would be great if I could also hook up a mic (through a preamp of course) and make speaker measurements as well. That way I don't have to get a separate (and very similar) audio interface to do the speaker work.

I can't find any information on the feasibility of speaker measurements with the QA400. Can anyone tell me if one is limited to the QA software or if it is possible to use something like REW with the QA400 for measurements?
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Old 26th February 2015, 09:18 PM   #1567
richiem is offline richiem  United States
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You can readily connect a mic preamp to the QA400 and do speaker spectra, impedance, etc. You are limited to using the QA software.
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Old 27th February 2015, 01:47 AM   #1568
1audio is offline 1audio  United States
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QuantAsylum QA400 and QA401
The QA400 is specifically not recommended for speaker work. Its not setup to deal with acoustics so you can get a lot of misleading results. Look for a setup with chirps, windowing and mike cal files as basic to measurements of speakers.

QA has mentioned supporting speaker measurements but its a lot of software stuff to do. The box won't talk to other software so its not useful except with the QA software.
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Old 27th February 2015, 02:03 AM   #1569
MuddJester is offline MuddJester  United States
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I was afraid of that. Makes sense with the custom drivers it uses. Thanks guys!
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Old 27th February 2015, 02:34 AM   #1570
davada is offline davada  Canada
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The QA400 is no better than a good sound card. QuantAsylum's aim was to remove the uncertainty of windows audio. The QA software bypasses windows audio eliminating the possibility of a user or other software from making level changes or altering the QA400's calibration. The QA400 front end is just a digital audio codec. Nothing special. The rest is in software and the communication between hardware and software, which is most likely handled by an FPGA.
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