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WolfX700 Measurement of iBasso DC02

Schackmannen

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I forgot to tell you that the dbspl of the second picture has been calibrated based on the T3 data.

It is indeed 10dbspl under the 20-20K bandwidth (I will not update the picture)
I was wondering about the SPL meter, didn't know you could give the analyzer data and have it calculate SPL values for you, that's very cool!
 

Pawelekdabek

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I guessed that Amir's measurement contains some digital domain issues(like 44.1 beat 48 or so), and WolfX-700 got much more clean FFTs indeed. Finally, dc02 still looks so-so because my $300 Redmi K20 Pro outperforms it with its 3.5mm jack, however, FFT now looks reasonably clear, without a forest of spread tones.
Could you measure 3.5mm output of K20 Pro and post it here?
 

tangojuliet

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I guessed that Amir's measurement contains some digital domain issues(like 44.1 beat 48 or so), and WolfX-700 got much more clean FFTs indeed. Finally, dc02 still looks so-so because my $300 Redmi K20 Pro outperforms it with its 3.5mm jack, however, FFT now looks reasonably clear, without a forest of spread tones.
I was planning to buy an dc02, and I own a K20pro. After reading your thread I am in confusion. Is really K20 pro DAC is better than dc02 ?
 

IVX

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Hi, the power of k20 pro, as I remember, about 20mW too. SNR -118db(A) but I didn't test if they use automute. THD+N a 32ohm were .001% as well at -1-3dbfs. After I charge my k20 pro, I can remeasure that.
PS: I did remeasure that. DR AES17 110db(A), SNR -118db(A) seems muted because of mismatch with SNR. No load .96VRMS, -113db 3rd -106db 2nd harmonic at the volume -1-3dbfs, THD+N reading .009%. Under 32ohm load .56VRMS THD+N reading .001%. UAPP player 24/48 used.
 
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IVX

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As I remember, the output Z was quite low too, but now I see the voltage dramatically drops under the load. K20pro charged 88%, airplane mode. If I connect it to the charger, DR becomes much worse, due to SMPS EMI noise. I used AUX0025 filter just in case to minimize any EMI related noise affect the result.
 

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bobbooo

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As I remember, the output Z was quite low too, but now I see the voltage dramatically drops under the load. K20pro charged 88%, airplane mode. If I connect it to the charger, DR becomes much worse, due to SMPS EMI noise. I used AUX0025 filter just in case to minimize any EMI related noise affect the result.

Thanks for these measurements. What did you measure the output impedance to be for the K20 Pro? Because Reference Audio Analyzer measured the Xiaomi Mi 9T Pro's output Z to be very high, at 22.7 ohms, see here, and as I understand the Mi 9T Pro and K20 Pro are the same phone just with different branding.
 
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