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Review and Measurements of Audio-GD R8

WolfX-700

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#1
In past measurements we have confirmed that even discrete R2R can perform very well.

However, many devices using the same type of technology perform poorly, which is why I mentioned in my previous measurements that I instinctively hate discrete R2R.

Today we have ushered in such a unit.

A reader of my website sent me this unit and he wanted me to measure it.

(If you are from China, I believe that by seeing the photos, you can already understand what terrible things will happen later) ;););)

Photo.jpg


This is the dashboard:

ALL.jpg



Dynamic-Range---AES17.jpg



Linearity-(-20.jpg



THD+N-Ratio-Freq.jpg




Multitone.jpg



All the above measurement results indicate that this is a garbage.

Even more frightening is that the manufacturer is a liar

Here are the measurements published by the manufacturer:

17211701THDbalance.jpg




My suggestion: you should Never Ever Forever consider this manufacturer's products.
 
Last edited:

solderdude

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#2
What does it look like up to 200kHz or so ?
The grass between the harmonics may be folded back into the audible range due to poor filtering.
Can you measure/make visible the low pass filter (if present at all ?)
 

WolfX-700

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#3
What does it look like up to 200kHz or so ?
The grass between the harmonics may be folded back into the audible range due to poor filtering.
Can you measure/make visible the low pass filter (if present at all ?)
This is the NOS 1M FFT measurement made before:

1M.jpg

I'll go to dinner first and come back to measure the filter characteristics
 

solderdude

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#5
looks like a filterless design or should I say headless design.

-100dB around 920kHz (for those with class-D amps)
 

solderdude

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#7
Well they did not lie completely .... the S/N ratio is >120dB, even in the measured one.
They just don't tell you that it drops tremendously when it has to do something (as in play music or test tones).
 
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