Electronics > Projects, Designs, and Technical Stuff
Analog Disovery as Audio Analyzer
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timb:

--- Quote from: jaxbird on June 03, 2016, 10:29:40 pm ---
--- Quote from: RandallMcRee on June 03, 2016, 09:35:42 pm ---In the ADC/DAC arena there is also this offering:

http://www.quantasylum.com/content/Products/QA401.aspx
folks on diyaudio seem to like it:
http://www.diyaudio.com/forums/equipment-tools/231401-quantasylum-qa400-qa401.html

QA401 is $429.

--- End quote ---

Thanks, that does look very interesting, but at $429 it's a bit of an investment for something that might measure up to 80-90kHz (they don't specify bandwidth, so it could be a lot less) and give an extra 20-30dB dynamic range, it still needs attenuation for amplifier measurements, it seems the maximum input is close to that of the Analog Discovery, but it does appear to have differential inputs.

I'm not clear whether this device works like a sound card or it's got some proprietary USB interface.

--- End quote ---

It's proprietary, which is one of the selling points. The idea being that because it doesn't show up as a standard USB audio device, you don't have issues with other software (or the OS itself) changing the gain during a measurement.

They provide software that's fairly comprehensive; there's also third party support from at least one other popular audio analysis suite.

Seems like a nice system, but I'm not really sure how much better it is than a ~$100 24-bit USB ADC/DAC unit combined with one of the many audio analysis programs available. I guess the QA401 has built-in attenuation and can take a differential signal that's over 50Vrms, which is nice.
jaxbird:

--- Quote from: timb on June 04, 2016, 11:02:34 am ---
It's proprietary, which is one of the selling points. The idea being that because it doesn't show up as a standard USB audio device, you don't have issues with other software (or the OS itself) changing the gain during a measurement.

They provide software that's fairly comprehensive; there's also third party support from at least one other popular audio analysis suite.

--- End quote ---

Thanks, I think not relying on the volume setting is a plus, their specs are confusing, some places it says single ended, other places differential, and this was in one of the specs:

Input AC Impedance   10K   
Input Clip Level   +3 dBV = 1.41 Vrms = 4Vpp

That does require some external attenuation, not sure if they have anything to compensate for external attenuation, or even measuring output power.

jaxbird:
Video showing new features in use:


Oneminde:
Thestuffmade webpage is down and I really need a copy of the Audio Analyzer Suite, can anyone please share it ?
sarel.wagner:
Ditto please, thestuffmade website is still down, can someone please share the download? Or better dump it on dropbox or googledrive and share please?
Rgrds
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