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Review and Measurements of Topping DX3Pro DAC and Headphone Amp

ZenTraveler

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Unless you have low ohm headphones, the 10 ohm output resistance does not influence adversely the headphone output. As such, it's just a matter of making an informed buy. I wanted to use this with Sennheiser HD800, which are 300 ohms. As such the 10 ohm output resistance is pretty much irrelevant. People should do their homeworks before buying and then complaining (even more so when specs are widely available and published by the company itself). It's as simple as that.

https://archimago.blogspot.com/2020/06/measurements-topping-dx3-pro-v2-ldac.html
Even Tin T2 which is 16 ohm iem, almost no different with higher output impedance
Screenshot 2021-01-01 112742.jpg


KZ ZST which is 10 ohm iem, doesn't play well with higher output impedance
Screenshot 2021-01-01 112742.jpg


Each headphone react differently to higher output. As you said, do homework before buying.
Reference Audio Analyzer site is great place to check if higher output impedance will affect a headphone.
I think how the manufacturer implement or create the driver play a big part on whether the headphone will be affected by higher output impedance. Browsing few models, I noticed Audio-Technica have no issue while each Grado's model will have slight hump around 100mhz
 

gorman

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Each headphone react differently to higher output. As you said, do homework before buying.
Reference Audio Analyzer site is great place to check if higher output impedance will affect a headphone.
I think how the manufacturer implement or create the driver play a big part on whether the headphone will be affected by higher output impedance. Browsing few models, I noticed Audio-Technica have no issue while each Grado's model will have slight hump around 100mhz
Exactly. And here's 0 ohm amping vs 10 ohm amping with my HD800.

1609515287311.png


A.K.A. "irrelevant difference". Which leaves me with an excellent DAC. Not much more I could ask for.
Source
 
Last edited:

jlpl

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I had no intention to post in here anymore but...

People should do their homeworks before buying and then complaining (even more so when specs are widely available and published by the company itself). It's as simple as that.

https://archimago.blogspot.com/2020/06/measurements-topping-dx3-pro-v2-ldac.html

This are the topping specs from their website:

1609514613672.png


They say that the output impedance is lower than 10 Ohms but not an exact number. And it's not even right because the measured number by wolfx-700 was 10.4Ω.

I posted in this tread in the first place because this is the first link that you get when google topping dx3 pro, and it's not clear, from the thread title, that this review is not for the last iteration of this dac (not blaming amirm for that). The manufacture did not make it clear, as it maintained the same name, and even on amazon, the sellers maintained the reviews from the first iteration even thought the product is different.

People come here to do their "homework" but are misinformed by others who bought the second version but continue to post as if the product is the same, even when they know that it's not, and with that not advising about potential problems if using low impedance headphones.

I bought mine on a black Friday deal so didn't had much time to decide and didn't know that there was a different version than the one in this thread.

My goal is to warn people that is in the market to buy a new dac/hpAmp that the headphone amp on the dx3 pro newer version is not the same as the one that is reviewed here.

Don't have anything against people who buy amps that serve a specific pair of headphones, but when buying a dac/hpAmp I'm aiming for one that can be used with any pair of headphones and not be restrained to some. Don't want to buy one for each pair of headphones that I have or will be buying. But that is just me.

Farewell.
 

gorman

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People come here to do their "homework" but are misinformed by others who bought the second version but continue to post as if the product is the same, even when they know that it's not, and with that not advising about potential problems if using low impedance headphones.
Are there examples of people here glossing over the output impedance? It seems strange, as when I bought the product I got pointed out about the difference on these very pages, pointed to Wolfx-700's review and basically given all info I needed to make an informed purchase.

I own HD800, DT880 and Viso HP50.
1609520188026.png


For Beyerdynamic is irrelevant, for NAD it doesn't change the sound signature till 14KHz. Above there is no difference the 10ohm impedance doesn't make a difference, so at the same volume level very high frequencies might get slightly emphasized. But I honestly doubt my hearing capacity at those frequencies (given age).

So I don't know, I can simply stress the need to make an informed purchase and reiterate that I found all the relevant info on these pages.
 

gorman

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@amirm maybe you could put in greater evidence, at the beginning of the review, the fact that currently the product on sale is not the one reviewed here. And link to Wolf's measurements (if that's something you are willing to do).
 

Veri

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They say that the output impedance is lower than 10 Ohms but not an exact number. And it's not even right because the measured number by wolfx-700 was 10.4Ω.
Dude.. depending on how this measurement is done (how the dummy load is measured) it can easily vary by that much. 10.4, haha.. o_O
 

Mr:River

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Dx3 pro would be problem with a 35ohms HE400i?
Would amplification power be missing?
 

bleachershane

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Looking for some opinions/advice from Version 1 owners.

I got my DX3 Pro at the end of 2018, used it for a few weeks and then read the stories of loud bangs, blown headphone drivers and quite honestly I became nervous and stopped using the unit (I didn't want to risk my headphones and I dislike loud, unexpected sounds) so I went back to using my Focusrite Solo as my main listening source.

I left the unit plugged in the whole time and now I'm considering using it again. I'm really intrigued to find out if there are there any Version 1 users here that are still using their original units with headphones, without any faults rearing their heads?

My headphones are PSB M4U1
Impedance 32 Ohms
Sensitivity 1kHz/1mW 102dB

Not sure if the headphone specs made any difference in terms of what caused the blown headphone output issues...
 

BDWoody

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Looking for some opinions/advice from Version 1 owners.

I left the unit plugged in the whole time and now I'm considering using it again. I'm really intrigued to find out if there are there any Version 1 users here that are still using their original units with headphones, without any faults rearing their heads?
...

I use mine regularly.
Never a problem.
 

Toku

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Looking for some opinions/advice from Version 1 owners.

I got my DX3 Pro at the end of 2018, used it for a few weeks and then read the stories of loud bangs, blown headphone drivers and quite honestly I became nervous and stopped using the unit (I didn't want to risk my headphones and I dislike loud, unexpected sounds) so I went back to using my Focusrite Solo as my main listening source.

I left the unit plugged in the whole time and now I'm considering using it again. I'm really intrigued to find out if there are there any Version 1 users here that are still using their original units with headphones, without any faults rearing their heads?

My headphones are PSB M4U1
Impedance 32 Ohms
Sensitivity 1kHz/1mW 102dB

Not sure if the headphone specs made any difference in terms of what caused the blown headphone output issues...
I've been using two DX3 Pro Ver1s with the power on for a year and haven't had any problems. However, I'm not a heavy headphone user.
I have purchased several SMSL and Topping DACs so far, but DX3 Pro works most stably.
 

bleachershane

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I've been using two DX3 Pro Ver1s with the power on for a year and haven't had any problems. However, I'm not a heavy headphone user.
I have purchased several SMSL and Topping DACs so far, but DX3 Pro works most stably.
I did like the unit and found it quite stable in playing a variety of formats and bit rates. My other options was to finish building an O2 headphone amp I started about 5 years ago and using the line out of the DX3 to feed it. If I remember back, the line output didn't have issues with blow outs and DC on the lines?
 
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hi, i have not followed this topic for a long time and now i must sold my first revision unit. Could you tell me what is changed good / bad in second rev.? I know about problems some had with self turning off etc. but i have zero of it since 28 November 2018 (i've only bought a branded ac adapter for less interference)
 
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Looking for some opinions/advice from Version 1 owners.

I got my DX3 Pro at the end of 2018, used it for a few weeks and then read the stories of loud bangs, blown headphone drivers and quite honestly I became nervous and stopped using the unit (I didn't want to risk my headphones and I dislike loud, unexpected sounds) so I went back to using my Focusrite Solo as my main listening source.

I left the unit plugged in the whole time and now I'm considering using it again. I'm really intrigued to find out if there are there any Version 1 users here that are still using their original units with headphones, without any faults rearing their heads?

My headphones are PSB M4U1
Impedance 32 Ohms
Sensitivity 1kHz/1mW 102dB

Not sure if the headphone specs made any difference in terms of what caused the blown headphone output issues...

Hi there. An old user here. Purchased my unit back in early 2019 (V1). Besides some oddities that have occured in the last 2 years with the unit, it's still going! I use it every single day, either with my powered monitors or most often IEMs. Use both USB and bluetooth. I think my issues were ground loop related which I posted about in this very thread, which you can read about in the older pages. Its a solid unit, at least mine has been. I have no desire whatsoever to buy another amp/dac and will keep using until it finally dies on me which could be a long time from now!
 

Cidious

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Ohms are not the whole story.

My Mr Speakers Mad Dogs (Fostex T50rp with planar drivers) are 50ish ohms or so but they almost need as much amplification as my 600 ohm Beyers with dynamic drivers to sound really good.

Sensitivity also plays a role as some other aspects. People throwing ohm numbers around here like it's THE measurement of amplification.
 

Veri

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Ohms are not the whole story.

My Mr Speakers Mad Dogs (Fostex T50rp with planar drivers) are 50ish ohms or so but they almost need as much amplification as my 600 ohm Beyers with dynamic drivers to sound really good.

So they need a brand spanking new A30 Pro ;) haha.
 

Cidious

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Whats an A30 Pro lol. New Topping product?

Just to be clear. DX3 Pro can drive my cans just fine. Admittedly the 600ohm Beyers like a tad more but those are just power hungry cunts (I say that with all the love. And pull the modded class A Lehmann out for them). And I've got the Topping A50s that has the balanced port and yes it gives a bit more than the single ended port (and it's own single ended port) But not a ton more or anything.

On the DX3 Pro there would be occasions where you'd activate high gain with hard to drive cans.

Anything mainstream will do just fine! I've not really come across any cans other than the Beyer 600 ohms that it struggles with.
 
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