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Author Topic: iFi iDSD Nano Measurements  (Read 1939 times)

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Marvey

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Re: iFi iDSD Nano Measurements
« Reply #20 on: September 07, 2015, 05:05:26 AM »
Added 17 tone test.


Redid all tests for best case scenario. Not sure what happened before (maybe USB power from laptop sucks, or battery not fully charged.) Measurements look much better now.
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thune

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Re: iFi iDSD Nano Measurements
« Reply #21 on: September 07, 2015, 06:10:54 AM »
I'm trying to wrap my head around the 17 tone test, seems very interesting. Have you discussed it already? 100/200/300/400 and roughly third octave spacing above that. It doesn't seem to be about looking at IM sidebands, since groups of tones are harmonically related. I'm assuming that the peaks are a straight line in the input signal, and we're supposed to be looking at the straightness of the peaks in the output signal, but I don't know. Can you provide some insight into this test and how you interpret it?

Cool stuff.
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Xen

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Re: iFi iDSD Nano Measurements
« Reply #22 on: September 07, 2015, 03:11:44 PM »
Quote from: thune on September 07, 2015, 06:10:54 AM
I'm assuming that the peaks are a straight line in the input signal, and we're supposed to be looking at the straightness of the peaks in the output signal, but I don't know. Can you provide some insight into this test and how you interpret it?
I think that is one part of the information coming from the test. Also, you can compare the 17 tone to the 2 tone test and look at the noise generated when a DAC has to deal with a more complex load. I can definitely see the benefits of this test and currently cannot imagine any down-sides. Caveat is that I am still a noob in terms of the basics so I don't have the experience in looking for "gotchas".

EDIT: Just thought of some constructive critical questions:
Should the tops of the tones be linear? or Shouldn't harmonics be constructive interference?
Are the tones selected the "right" tones for the test? My knowledge of music theory is pretty low.
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EraserXIV

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Re: iFi iDSD Nano Measurements
« Reply #23 on: September 07, 2015, 07:21:27 PM »
The built in amp in this thing sounds like ass and really holds it back. As a DAC only it sounds OK.. but that really isn't its target function and one would be better served with a Modi 2U if you're hooking it up to another amp.
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