Review and Measurements of New Topping D50s DAC

[Calexico]

I have done that before. 16 bit results usually clip to 96 dB SINAD. 96 kHz will add noise and ultrasonic distortion so likely will be similar to THD+N versus frequency that I posted.

It means high res files results in more noise and ultrasonics distortion so cd is better?

 

[SIY]

It means high res files results in more noise and ultrasonics distortion so cd is better?

How's that refund coming?

 

[Calexico]

Noise is inherent in any amplifier. Namely the output opamps. Also you need to learn something about noise integration and how thd+n is calculated with different bandwidths. With non weighted integration High frequency noise contribute to a lot to the results. The reason amir is using that is because more accurate representation for high frequency distortion. Otherwise we will see a dropping thd after 7khz due to limited bandwidth.

@amirm maybe this ultrasonic distortion is not hearable but can interract with other elements in the amp and in the speaker and then become hearable. Then why not making a test to show all the ultrasonic noise?

 

[Calexico]

How's that refund coming?

Amirm said that 96 kHz will add noise and ultrasonic distortion so

 

[JohnYang1997]

It means high res files results in more noise and ultrasonics distortion so cd is better?

The noise will always be there in the reproduction chain. Even though it's not in the cd file itself. The final output will still have not only to 90khz probably a few hundred khz and may have rising noise. However due to cable capacitance, driver inductance and the transducer and our ear. They can't possibly affect the listening experience.
The true benefit of hires is to have a linear phase response without ringing in time domain leaving the only filtering to be our ear. The high frequency content won't cause any audible improvements.

 

[Calexico]

@amirm if you make a band limited test on a nos dac you will get rid of the ultrasonic image above niquist
Isn't it cheating to hide ultrasonic noise on measurements?

 

[JohnYang1997]

Amirm said that 96 kHz will add noise and ultrasonic distortion so

Please educate yourself.

also
https://en.m.wikipedia.org/wiki/Total_harmonic_distortion

 

[daftcombo]

Here is a double test: optical input and THD+N vs Frequency:

View attachment 28440

There is an ultrasonic tone at 28 kHz when feeding it 20 K input that is at -80 dB or so, setting that limit.

Hmm looks not very good now!
Is that the secret of chi-fi?

 

[JohnYang1997]

for noise also see
https://en.m.wikipedia.org/wiki/Johnson–Nyquist_noise
and
http://www.ti.com/lit/an/slva043b/slva043b.pdf

 

[Calexico]

Please educate yourself.

also
https://en.m.wikipedia.org/wiki/Total_harmonic_distortion

Well say this to amirm i just quote and ask

 

[JohnYang1997]

Well say this to amirm i just quote and ask

No. Amirm is not wrong. It's just that you can't get what he was saying and misunderstood. He's talking from the measurements perspective. Not the DUT perspective. Higher the bandwidth set on the analyzer higher the noise there will be.

 

[Calexico]

No. Amirm is not wrong. It's just that you can't get what he was saying and misunderstood.

I misunderstood nothing i just asked a question. I didn't claim anything.
You want to confuse my questions or what?
If ultrasonic noise and distortion is hidden for sinad test we don't see if the filter of the dac does a good job. Then it's cheating.

 

[JohnYang1997]

I misunderstood nothing i just asked a question. I didn't claim anything.
You want to confuse my questions or what?
If ultrasonic noise and distortion is hidden for sinad test for test we don't see if the filter of the dac does a good job. Then it's cheating.

Just read through and watch the material I shared. And it will solve all the problems.

 

[SIY]

I misunderstood nothing

That turns out not to be the case.

 

[Calexico]

So you think it's normal to mask the content above 20khz for testing? When why making a filter if the ultrasonic content is not important?? It's crazy.
We should test if the filter make a good job.

 

[Calexico]

You get good measurements results because you hide the ultrasonic garbage. If filter were good engeenered there wouldn't be ultrasonic garbage and then not need to hide it to get good sinad.

 

[Calexico]

@SIY i believe tube buffer could hide this ultrasonic garbage by adding ultrasonic distortion more musical

 

[JohnYang1997]

You get good measurements results because you hide the ultrasonic garbage. If filter were good engeenered there wouldn't be ultrasonic garbage and then not need to hide it to get good sinad.

What filter?
It's not matter of filter.
And not only you were misunderstanding, but also you don't even know what you are talking about. End of story.

 

[Calexico]

Anyway that's not serious to hide the garbage to get good results.

 

[JohnYang1997]

@SIY i believe tube buffer could hide this ultrasonic garbage by adding ultrasonic distortion more musical

You believe a contradictory and meaningless statement. Yea that's your belief.