Master Thread: Are measurements Everything or Nothing?

[SIY]

Why not buy those with your own money, like I do?

Because I don't need them?

 

[SIY]

I hear it's better than crocodiles.

The love of a sasquatch is not like the love of a square.

 

[Pdxwayne]

What are you doing with it all?

I returned two DAC and one HPA due to issues I observed.

So, I have 3 pairs of DAC+amp combo now.

One pair is used in living room.

One pair is in computer room.

One pair currently seldom used.

I got more DAC and amp because I wanted features like display, xlr output, etc.

Headphones is because I am curious about the difference between dynamic drivers vs planar-magnetic.

 

[Miska]

By the way, I wouldn't be surprised if this kind of strange behavior is related to running/having the MQA code on XMOS. Wouldn't be first time...

 

[Blumlein 88]

I just accidentally got this result. Source from REW via Topping 10B to Zen Tour. 48 khz recorded at 96 khz. Signal is 19 and 20 khz at - 60 db. 256 k fft.

This is the same signal with this result only using Audacity to generate and play the tone.

 

[voodooless]

I just accidentally got this result. Source from REW via Topping 10B to Zen Tour. 48 khz recorded at 96 khz. Signal is 19 and 20 khz at - 60 db. 256 k fft.

This is the same signal with this result only using Audacity to generate and play the tone.

The images don't seem to work...

Edit: fixed now, thanks @Blumlein 88

 

[dc655321]

By the way, I wouldn't be surprised if this kind of strange behavior is related to running/having the MQA code on XMOS. Wouldn't be first time...

Again, your findings are unlikely to result in audible issues with that DAC. Would you agree with that?

So, I'm still not certain what statement(s) you are trying to make:
- the ASR measurement of that device failed to capture that behavior? And...?
- you are knowledgeable? Yes...
- an honest disclosure of information to others?
- all/none of the above?

Help me out here, please.

 

[storing]

I think they are self-explanatory for this forum's audience?

The plots, probably, but I think the audience wants to know the methods exactly, i.e. as detailed as possible how the data in the plots was retrieved and with which parameters the plot was made. (apologies if you told this already, then I missed it)

edit this is just in: https://www.audiosciencereview.com/...-hump-revisited-khadas-tone-board-v1-3.30136/ and is a fine example of the amount of the detail 'the audience' (or some at least) wants to see.

 

[Blumlein 88]

Then have REQ make a PCM file of the test signal, and FFT that directly. That should show if the problem is with generation.

Looks clean that way.

 

[Blumlein 88]

The images don't seem to work...

Let me fix this. I posted in the wrong thread and moved them. Somehow lost the image.

Okay images are in the previous post now.

Master Thread: Are measurements Everything or Nothing?

Why not buy those with your own money, like I do? Because I don't need them?

www.audiosciencereview.com

 

[voodooless]

Looks clean that way.

Mkay, so it could then still be the way REW plays it. I don't know if the Java subsystem has any particular issues with this. It has been a very, very long while since I've had a look at that. Back then I didn't know I might care

 

[Miska]

Again, your findings are unlikely to result in audible issues with that DAC. Would you agree with that?

No...

So, I'm still not certain what statement(s) you are trying to make:
- the ASR measurement of that device failed to capture that behavior? And...?

ASR yes, some other people measuring same device partially captured something similar.

I just find it interesting result.

Help me out here, please.

For the topic it is just interesting that let's say having nice result for 1 kHz 0 dBFS THD test tone doesn't necessarily indicate that there are no other hidden problems.

 

[pseudoid]

(1)Can you elaborate as to which ones those are? Possibly you have better luck deciphering Google Translate gibberish? It's really not the right tool to use for a complex conversation.

(2)Indeed, please don't touch the fonts, especially the colour. Black text with dark themes on the forum does not work together.

(1) I thought I did!
(2) You do you, I'll do me!

 

[Pdxwayne]

I just accidentally got this result. Source from REW via Topping 10B to Zen Tour. 48 khz recorded at 96 khz. Signal is 19 and 20 khz at - 60 db. 256 k fft.

View attachment 180575
This is the same signal with this result only using Audacity to generate and play the tone.

View attachment 180573

The last time I tried to use REW to capture freq response via mic, it wasn't working. I wonder all those Windows updates caused any issue with REW. I am thinking to remove my version and install whatever latest one soon.

 

[voodooless]

(1) I thought I did!

I must have still missed it then.

 

[pkane]

I just accidentally got this result. Source from REW via Topping 10B to Zen Tour. 48 khz recorded at 96 khz. Signal is 19 and 20 khz at - 60 db. 256 k fft.

View attachment 180575
This is the same signal with this result only using Audacity to generate and play the tone.

View attachment 180573

Are you sure the first one wasn't generated/processed as 16 bits and the second one, as 24?

 

[Blumlein 88]

The last time I tried to use REW to capture freq response via mic, it wasn't working. I wonder all those Windows updates caused any issue with REW. I am thinking to remove my version and install whatever latest one soon.

The REW generating the signal is on a MacBook Pro. I am a version or two behind current.

 

[Blumlein 88]

Are you sure the first one wasn't generated/processed as 16 bits and the second one, as 24?

Yes positive. The noise floor goes up 7 or 8 db vs 24 bit, but if I use higher rates that is all it is clean otherwise.

 

[LTig]

Yes positive. The noise floor goes up 7 or 8 db vs 24 bit, but if I use higher rates that is all it is clean otherwise.

Beats me. Different drivers in REW and Audacity?

 

[Blumlein 88]

Beats me. Different drivers in REW and Audacity?

I'm not sure how to answer that on a Mac. I may try it in the other direction as there is an ASIO driver for the D10B.

BTW, Miska will find flaws in ADC and DAC gear like nobody else. I forget how it was tripped up now, but he showed me a truly bizarre behavior in the Focusrite Forte. It wasn't anything that would occur with music, but with a certain signal sent to it the result was bonkers. He's found other incorrect behavior in a plenty of things. I seem to recall one of them was a Tascam interface that also could go weird in just the right circumstances.