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Review and Measurements of Topping DX3Pro DAC and Headphone Amp

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Just received the Topping DX3 Pro however have not received my DT1990's yet so I'm using my old DT990's.

Going from my iFi nano BL to the DX3 is almost night and day. The sound seems to widen and bring out the musicality of the DT990's much more, the sibilance is tamed quite a bit and the clarity is absolutely sublime and crystal clear. The lack of channel imbalance is also very welcoming coming from the nano. I do very much hope this unit lasts because my experience so far has been mesmerizing.

Big thanks to Amir for the review.
 

Music1969

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Feb 19, 2018
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Hi @amirm

Any chance you can measure the headphone output distortion, the same way you measured for the Chord Hugo2, testing against real headphone loads?
 
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This unit doesn't have protective circuit to prevent headphone or hearing damage. There has been some reported cases of damaged headphones due to DC voltage reaching the driver coils.
Is there any Aftermarket adapter or socket for that function?
 

pauze

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Oct 12, 2018
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Ah yes, i forgot to ask.

Anyone here with any 600ohms HP ? I will be using the Beyer T1 (gen 1) on the DX3 Pro.

As such, going by @amirm tests, i believe it will be able to drive it successfully ?
I have Beyer DT880 600ohms. I feel the DX3pro can drive my headphones to uncomfortably loud volumes on most of my music, and that's close to max volume in high gain mode. On quieter tracks, I'd love to have more room to go louder that the DX3 allows, but they still play loud enough for me to enjoy. I am looking to perhaps add an Atom to my setup for those times I want more power with those headphones, but am in no rush considering how loud it already plays.
 

JohnYang1997

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I have Beyer DT880 600ohms. I feel the DX3pro can drive my headphones to uncomfortably loud volumes on most of my music, and that's close to max volume in high gain mode. On quieter tracks, I'd love to have more room to go louder that the DX3 allows, but they still play loud enough for me to enjoy. I am looking to perhaps add an Atom to my setup for those times I want more power with those headphones, but am in no rush considering how loud it already plays.
Atom won't make much of difference in power. It's limited by supply rail. Surely it's not that the performance degrades with 600ohm load or anything. And more power for 600ohm won't make any difference in sound quality either.
If you want very high power into 600ohm, you either want a discrete design or a balanced output. The former can have much higher supply rail that allows much higher voltage swing hence needed for 600ohm load. The latter, will give 6db extra headroom , 2 times the level, 4 times the power.
 
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I just saw a review of the DX3 Pro in youtube and there was some issue with the line-out and pre-amp switching when using the volume knob , I just want to clarify if the remote can switch from headphones to pre-amp mode with a single press, as I want to use the pre-amp mode for volume control.

I also wonder how this DAC performs in gaming, Id assume they are far superior in SQ as compared to the Sound Blaster Z
 

JohnYang1997

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The impedance of headphone that can be used with DX3Pro is 16 Ohm to 300 Ohm in standard.
600ohm is a more comfortable load for amplifiers. The distortion only will be lower with 600ohm at the same voltage. "Issue" is the power rating will be lower because it takes higher voltage for same power and the power rail is not high enough. It may not actually be an issue unless it literally runs out of volume.
 
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I just saw a review of the DX3 Pro in youtube and there was some issue with the line-out and pre-amp switching when using the volume knob , I just want to clarify if the remote can switch from headphones to pre-amp mode with a single press, as I want to use the pre-amp mode for volume control.

I also wonder how this DAC performs in gaming, Id assume they are far superior in SQ as compared to the Sound Blaster Z
Was this Zeos review? Its so easy to change between headphone and pre-out, its one button on the remote for headphone out, and one button for pre-out, you press the pre-out button again and it goes to line-out. Zeos issue was that people could accidentally press the line-out button twice and go to full line-out with loud volumes playing. I've done it twice myself, but I don't do that anymore as you learn pretty quickly not to double press it!!, I don't think its a big issue. Perhaps what would have been an interesting feature was if they had put sperate volume channels for line out and headphone out, so that when you change between the two the DX3 remember different volumes for either output.
 

JohnYang1997

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I haven't found anything in this thread to solve the problem. Topping is working on a version 2 that would include the protective circuit.
Just tested again it can reach under 0.001% to 0.0009% with 8ohm load 125mw.
However if you are waiting for the version 2, i heard there will be a increase in output impedance. That will be a deal breaker.
BTW when I was testing I got a loose connection and the unit turned of itself. It certainly has over current protection. I don't see the need for version 2.
 
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