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Review and Measurements of New Topping D50s DAC

Gradius

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Is it possible to configure 32bit float as output? In the sound properties 24bit 192Khz is the maximum I see on Win7 SP1 x64.
I'm using HeSuVi which mixes in float so I want to avoid the down conversion to 24bit.

I have fixed as 32-bit.

Click on "Topping USB Audio Device Control Panel", go to tab "Format".
 

Dogway

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Me too, but on windows sound properties max is 24bit, does this mean HeSuVi outputs 32bit float, windows converts to 24-bit and then the the dac converts back to 32bit?
rate.png
 

Chrise36

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I guess it's magic that moving the D50s away from the router fixed it if it was a ground loop eh? All other connections are the same.
I think you are right because i had similar problems when my phone was near the dac. No problems when i placed it away from the dac.
 

Gradius

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Can you test coax and optical?

ATM I don't have any receiver as I sold them. I have a pair of Yamaha HS80M (modded by myself), connected to D50s, so to me is more than enough.

However coax/optical are limited to just 192kHz @ 24-bit.

Why you want me to test them?
 
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Gradius

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Today I decided to look into Dolby Digital Plus, as I used it before with my old Asus STX (it was called Dolby Home Theater v4).

After like 10 minutes, it's a "newer" version (as I was using 7.2.7000.4), many things changed... but...

Yep! Now I'm using with Topping D50s. Oh boy, the joy. :p

The version is 7.6.5.1.
 

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Chrise36

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ATM I don't have any receiver as I sold them. I have a pair of Yamaha HS80M (modded by myself), connected to D50s, so to me is more than enough.

However coax/optical are limited to just 192kHz @ 24-bit.

Why you want me to test them?
I thought i ask if someone has tested these inputs as i want to connect my media box and tv on these.
 

Chrise36

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I have fixed as 32-bit.

Click on "Topping USB Audio Device Control Panel", go to tab "Format".
Do you feel there is difference between 24bit and 32 bit? I dont think i hear any difference in my system.
 

Chrise36

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There most definitely shouldn't be.
I find it is the same between 24/384 and 24/96 and in fact with 24/384 there is a crackling noise everytime the dac is swithing but not with 24/96.Do you think the chip is working harder with higher resolution affecting longevity?
 
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Dogway

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I find it is the same between 24/384 and 24/96 and in fact with 24/384 there is a crackling noise everytime the dac is swithing but not with 24/96.Do you think the chip is working harder with higher resolution affecting longevity?
The DAC is internally 32bit so more than 24 vs 32 it was to keep the bitdepth chain without conversions. Anyway this ESS paper also caught my attention.
I also get a crackle noise everytime I switch it on or off, normally I'm at 44.1 or 48Khz, not sure if this is to be expected.

Regarding the Windows 7 not having 32bit options I will guess this is by (OS?) design, so whatever, sounds fine regardless.
 

Chrise36

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The DAC is internally 32bit so more than 24 vs 32 it was to keep the bitdepth chain without conversions. Anyway this ESS paper also caught my attention.
I also get a crackle noise everytime I switch it on or off, normally I'm at 44.1 or 48Khz, not sure if this is to be expected.

Regarding the Windows 7 not having 32bit options I will guess this is by (OS?) design, so whatever, sounds fine regardless.
You can swith on the amp a couple of seconds after turning on the dac to avoid this noise but the other noise when swithing to higher frequency can not be avoided on my system
 

Gradius

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I also get a crackle noise everytime I switch it on or off, normally I'm at 44.1 or 48Khz, not sure if this is to be expected.

Higher than 48kHz is very perceptible, this is why you are able to hear it. Is perfectly normal, but they (Topping) could put a better "filter" there to avoid any noise while switching audio resolutions. They didn't.

I find it is the same between 24/384 and 24/96 and in fact with 24/384 there is a crackling noise everytime the dac is swithing but not with 24/96.Do you think the chip is working harder with higher resolution affecting longevity?

Isn't really "cracking noise", is just a "pop" sound.

Nothing to do with longevity. The 1st one to fail will be the display. All the rest should works fine for 20~30 years.

The pop happens everytime when the frequency of the clock on the PCB needs to be changed.
 
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Gradius

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This is an elegant solution to avoid any POP, but there is no such circuity inside D50s, so you will need to live with that.

XILINX CPLD shaping circuit:
Adopt XILINX CPLD switch instead of the internal switch of ES9038Q2M;
Add digital shaping to optimize clock signal jitter, achieve better details and avoid switching POP sound.

Added pictures as how it looks like.

Edit:
Checking more about the ES9038 IC, it already has ASRC (Asynchronous Sample Rate Conversion) & Jitter Reduction internally.

Going more into, I ONLY get that "POP" sound switching @ 384kHz. I'm still investigate this.

Edit2: The circuit is to remedy the changes made on Windows.
 

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Gradius

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I'm using Dolby Atmos now... yep, it's better than DD+.
 

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Gradius

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Changed the OPAs (took me 1h).

Goodbye 1612... Welcome 1656.

The only thing I'm waiting now is the "legendary" LME49990MA, to be swapped with LME49720HA.

Impressions? I'm getting the best audio I have hear from a DAC so far.

A simple diagram from OPA1612:
1 400 (OUT A)
2 400 (-IN A)
3 10K (+IN A)
4 V-
5 3.3K (+IN B)
6 400 (-IN B)
7 400 (OUT B)
8 V+

PS: 400 Ohms. 3.3k Ohms. 10k Ohms.
 

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Reddy

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The tps65130 inside also makes things worse.
I will remove the switcher and supply by lt3045 +-9v.
 
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