• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required as is 20 years of participation in forums (not all true). Come here to have fun, be ready to be teased and not take online life too seriously. We now measure and review equipment for free! Click here for details.

Review and Measurements of Topping DX3Pro DAC and Headphone Amp

RHO

Senior Member
Joined
Nov 20, 2020
Messages
485
Likes
334
Location
Belgium
My DX3pro doesn't do what the manual says it should do. I don't know how to switch it to DAC mode.
This is what the manual says:
Manual_output_settings.PNG

The first option: seems to work as indicated. Headphone indicator is on. Headphone amp works. But I have no way to check if the RCA out is on or off.
Second option: I have no idea how to get to this setting. I can get the headphone indicator on AND the DAC indicator on. Is this what is meant here?
Third option (pure DAC functionality): I have no idea how to get to this setting.
Fourth option (pre-amplifier): I can get the DAC indicator on (HP indicator off). HP amp switches off and the volume control seems to work. But again, I can't check it.
 

ZenTraveler

Member
Joined
Feb 14, 2020
Messages
48
Likes
37
I don't know how to switch it to DAC mode.
You might have V2, with this version to switch DAC line out you need to unplug the power from the unit, hold down the volume button and re-plug the power. It will display menu selection, click the volume button to go through the menu, for DAC it is D-0.

Second option is when both indicator is ON.
 

RHO

Senior Member
Joined
Nov 20, 2020
Messages
485
Likes
334
Location
Belgium
You might have V2, with this version to switch DAC line out you need to unplug the power from the unit, hold down the volume button and re-plug the power. It will display menu selection, click the volume button to go through the menu, for DAC it is D-0.

Second option is when both indicator is ON.
Yep, I managed to get into the settings the way you pointed out. Thanks!
 

RHO

Senior Member
Joined
Nov 20, 2020
Messages
485
Likes
334
Location
Belgium
You might have V2, with this version to switch DAC line out you need to unplug the power from the unit, hold down the volume button and re-plug the power. It will display menu selection, click the volume button to go through the menu, for DAC it is D-0.

Second option is when both indicator is ON.
I found that it's actually when D-1 is selected that the volume control is deactivated and the sample frequency is displayed in DAC mode.
When D-0 is selected the volume control stays active in DAC mode so you essentially have pre-amp.
 

sjeesjie

Active Member
Joined
Aug 16, 2020
Messages
124
Likes
55
Recently I noticed that the supplied power unit makes a slight buzzing noise. Should I worry?
 

dawit123

Member
Joined
May 3, 2020
Messages
5
Likes
1
I'm new to the hobby and have a couple questions:

1. Any benefits for running it over S/PDIF vs USB?
2. Seems like there is not much volume headroom for my HD600? Running it usually at around -20db on low and high gain.
3. Is it better to run it in DAC mode or normal mode? Any differences?



----

Recently I noticed that the supplied power unit makes a slight buzzing noise. Should I worry?

Mine power adapter does the same whine - https://superuser.com/questions/832...supplies-generate-a-whining-noise-and-what-ca
 

RHO

Senior Member
Joined
Nov 20, 2020
Messages
485
Likes
334
Location
Belgium
I'm new to the hobby and have a couple questions:

1. Any benefits for running it over S/PDIF vs USB?
2. Seems like there is not much volume headroom for my HD600? Running it usually at around -20db on low and high gain.
3. Is it better to run it in DAC mode or normal mode? Any differences?



----



Mine power adapter does the same whine - https://superuser.com/questions/832...supplies-generate-a-whining-noise-and-what-ca
20dB is quite a bit of headroom. I think Amir has a video about how the dB scale works.
 

THW

Senior Member
Forum Donor
Joined
Nov 21, 2018
Messages
412
Likes
613
2. Seems like there is not much volume headroom for my HD600? Running it usually at around -20db on low and high gain.

-20dB on high gain for the HD600 for me also and i have to say that is all the headroom that i really need. on tracks that are mastered loudly i have to dial it back down to -25 or even -30. and for all the music that i listen to, the most i had to go was around -10 to -15, and -10 in most cases is excruciatingly loud for me
 

RHO

Senior Member
Joined
Nov 20, 2020
Messages
485
Likes
334
Location
Belgium
I have hardly ever turned the volume up above -30dB on my DX3pro. Mostly it was between -45dB and -40dB on high gain with my HD6XX. (using it in DAC mode connected to an A50s now)
You guys must be listening much louder than I do.
 

THW

Senior Member
Forum Donor
Joined
Nov 21, 2018
Messages
412
Likes
613
I have hardly ever turned the volume up above -30dB on my DX3pro. Mostly it was between -45dB and -40dB on high gain with my HD6XX. (using it in DAC mode connected to an A50s now)
You guys must be listening much louder than I do.

i listen fairly loudly but even i think 20 dB of headroom is more than good enough.
 

artburda

Active Member
Joined
Feb 12, 2019
Messages
171
Likes
208
Location
Switzerland
I have hardly ever turned the volume up above -30dB on my DX3pro. Mostly it was between -45dB and -40dB on high gain with my HD6XX. (using it in DAC mode connected to an A50s now)
You guys must be listening much louder than I do.
But why use it in high gain in the first place, if you have to lower the volume to -40dB?
 

RHO

Senior Member
Joined
Nov 20, 2020
Messages
485
Likes
334
Location
Belgium
But why use it in high gain in the first place, if you have to lower the volume to -40dB?
I could switch headphones easily by just switching between high and low gain if I went from the HD6XX to something more efficient. :)
But yeah... there was no real need for high gain.
 

artburda

Active Member
Joined
Feb 12, 2019
Messages
171
Likes
208
Location
Switzerland
I could switch headphones easily by just switching between high and low gain if I went from the HD6XX to something more efficient. :)
But yeah... there was no real need for high gain.
And if I understand it correctly: when you lower the volume with the dx3pro digitally then the noise floor gets worse. Since the dx3pro has a SNR of about 117dB minus the 40dB digital attenuation would mean you now have a SNR of 77dB. Please correct me if I‘m wrong.

Edit: Or 117dB plus 9dB for high gain —> so 86dB instead of 77dB?
 

Toku

Major Contributor
Joined
Apr 4, 2018
Messages
1,194
Likes
998
Location
Japan
Looks like these are sold out. Is a new version coming soon?
Is it a discontinued model? Or is it a temporary suspension of production due to a shortage of semiconductors?
But Shenzhen Audio seems to have stock.
 

RHO

Senior Member
Joined
Nov 20, 2020
Messages
485
Likes
334
Location
Belgium
And if I understand it correctly: when you lower the volume with the dx3pro digitally then the noise floor gets worse. Since the dx3pro has a SNR of about 117dB minus the 40dB digital attenuation would mean you now have a SNR of 77dB. Please correct me if I‘m wrong.

Edit: Or 117dB plus 9dB for high gain —> so 86dB instead of 77dB?
Increasing the gain usually increases noise also.
Like in this graph:
index.php

You see the jump in THD+N between low gain and high gain. I think this is predominantly the increase in noise.
Lowering signal amplitude also brings the signal closer to the noise.
 

ClosDeLaRoche

Active Member
Joined
Jun 21, 2019
Messages
107
Likes
87
Is it a discontinued model? Or is it a temporary suspension of production due to a shortage of semiconductors?
But Shenzhen Audio seems to have stock.
I see no stock anywhere.

Hopefully this is an opportunity to refresh the model.

I like the product concept, all in one unit including a remote, Bluetooth and headphone amp for around $200, but this thing was plagued with issues.

Personally I got one with a broken volume knob. Twisting it one way would change the volume in the wrong direction for a step, then it would go the right direction. I encountered a DX7 Pro that did the exact same thing. I swore off of topping after that but I might give them another shot if they sort out these issues.
 

Toku

Major Contributor
Joined
Apr 4, 2018
Messages
1,194
Likes
998
Location
Japan
I see no stock anywhere.

Hopefully this is an opportunity to refresh the model.

I like the product concept, all in one unit including a remote, Bluetooth and headphone amp for around $200, but this thing was plagued with issues.

Personally I got one with a broken volume knob. Twisting it one way would change the volume in the wrong direction for a step, then it would go the right direction. I encountered a DX7 Pro that did the exact same thing. I swore off of topping after that but I might give them another shot if they sort out these issues.
The volume of DX3Pro is not a general volume but a rotary encoder. In the structure inside, many electrodes are printed on the circumference of a disk-shaped insulating substrate, and the rotation angle is detected by rubbing it with a mechanical brush.
Due to its simple structure, the behavior you point out will inevitably occur. It will occur again if you use it even if you replace a new part.
The frequency of occurrence is proportional to the number of times the dial knob is turned.
If you don't like it, use the remote control to operate it.
I know the structure and drawbacks of this part, so I usually operate it with a remote control.
 
Top Bottom