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Trying to test audiocards...the wrong way?
lordofthediscs
post Feb 9 2013, 22:35
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Hi there.

I was trying to make some tests to audiocards that I own (Roland UA-1G, M-Audio 2494, M-Audio Delta 1010LT), in order to do some other testing after that with several CD, DVD players, Media Centers, etc.

My first thought was something like having the outputs of the soundcard connected to the inputs, play one song and record it on another track (I'm using Nuendo).
That's the part of the process where all things worked out as planned, except...
...I was thinking that by doing this, if I phase reversed one of the stereo tracks, I would end up only with the differences between the two (or nothing, on a perfect scenario).

I had to compensate for the delay and any volume difference, but on the best 'phase cancellation' spot, I still hear (mostly) the very high frequencies.

That didn't surprised me on the Roland UA-1G, as it's a USB card with volume control and dedicated to record instruments on the go, so I would find fair enough that it wasn't very flat on high frequencies. That's something that even REW confirms in the 'soundcard calibration' part of the setup.

But having the same behaviour with both the M-Audio made me wonder if there's something wrong with my test basics.

I'm playing and recording at 44.1 and 16 bit (trying to keep it from the original source to the end Wave file), so any input on this theory would be appreciated. smile.gif

Thanks


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db1989
post Feb 9 2013, 22:37
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The standard recommendation is a loopback test using RightMark Audio Analyzer.

This page offers some warnings, best practices, and criticisms.

This post has been edited by db1989: Feb 9 2013, 22:41
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Arnold B. Kruege...
post Feb 12 2013, 15:48
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QUOTE (db1989 @ Feb 9 2013, 16:37) *
The standard recommendation is a loopback test using RightMark Audio Analyzer.

This page offers some warnings, best practices, and criticisms.



Every point made above is factual but at least half or more of them can be circumvented. I'd post them but I would like to leave fixing them as work for the Rightmark support team.

BTW the software that NWAVguy uses is called Spectra Lab, and the edition he is using ran something over $800 including all apparent features and plug-ins, the last time I checked.

So, the freeware Audio Rightmark software, which I'd put at being capable of 90+ percent of what needs to be done, and maybe 80% of what could be done as one heck of a deal.

The Rightmark software will also build a postable web page, which is at least a half hour's work if you are using Spectra.
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stv014
post Feb 26 2013, 17:17
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QUOTE (Arnold B. Krueger @ Feb 12 2013, 15:48) *
So, the freeware Audio Rightmark software, which I'd put at being capable of 90+ percent of what needs to be done, and maybe 80% of what could be done as one heck of a deal.

The Rightmark software will also build a postable web page, which is at least a half hour's work if you are using Spectra.


Indeed, the main advantage of RMAA is that it lets the casual PC user perform basic audio tests with only a few clicks, even though its tests are not very extensive, and some are also inaccurate or buggy. For example, the crosstalk measurement seems to show 6 dB better values than reality, and the noise levels are also "improved" by 2-3 dB. I tested these by using the generate/analyze WAV functions, and processing the WAV file so that it has a known amount of noise, distortion, or crosstalk, etc. added.
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