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Fosi Audio ZD3 Balanced DAC Review

Rate this DAC:

  • 1. Poor (headless panther)

    Votes: 5 1.5%
  • 2. Not terrible (postman panther)

    Votes: 7 2.1%
  • 3. Fine (happy panther)

    Votes: 81 24.1%
  • 4. Great (golfing panther)

    Votes: 243 72.3%

  • Total voters
    336
I wanted to chime in with my experience with the ZD3 after a week or two of listening to a wide variety of music and TV audio. My setup is a Wiim Mini => optical SPDIF => ZD3 => XLR cables => Hypex Nilai stereo amp=> Salk Veracity ST. Also have a Sony Bravia OLED connected via HDMI Arc.

ZD3 has been flawless as far as audio quality—no dropouts or other issues. Haven’t noticed any pops when switching bitrates, which is awesome! It’s also dead silent with no input—passes the “ear to the tweeter” test easily.

My only complaint is that I am also experiencing the phantom power ons that others here have discussed when using the HDMI input. It doesn’t always happen, and I’m not sure of the timeframe. Of course, I’m triggering my amp from the ZD3 so that powers on as well, which is not ideal. I believe I have the most recent hardware (with the longer antenna) so I guess this hasn’t been fully resolved(?)

So that’s my two cents…thanks for any insight on the power issue.
 
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Your account shows that you are new here, so welcome to ASR. Your comments about the display, remote and usability are welcome. However, talking about "musicality" and "sound stage" of a modern DAC will likely result in some blowback in a science-leaning forum like ASR.

To put it bluntly, your listening tests are invalid and cannot yield any reliable result. You're trying to judge a device with 120 dB SINAD - that is inaudible distortion and noise - using a tube amp which the manufacturer specs at -60 dB THD without any word about noise. That's three orders of magnitude worse than the DAC. There is no way you could tell any difference there - even if it existed.

Second, well engineered DACs are audibly transparent and have been for some time. They don't have a sound. You can randomly switch one transparent DAC for another and they will sound 100% identical. Any DAC that audibly alters the sound in any way is broken and should be repaired or replaced. After all, it failed at its one and only job: Converting digital signals to analog as precisely as possible.

If you want, you can read lots of useful information about how to properly test audio devices, how to interpret test results correctly and lots of other useful stuff on ASR. I would encourage you to do so.
Out of interest are you an actual engineer? For the record, and to be clear here I'm a chartered engineer in mechanical engineering, so I work in a professional engineering environment, and the cynicist in me makes me sceptical if I think someone's is simply on the first peak of Dunning Kruger, but responding as if they were a pro, especially when they make themselves out as a forum spokesperson.
 
Out of interest are you an actual engineer? For the record, and to be clear here I'm a chartered engineer in mechanical engineering, so I work in a professional engineering environment, and the cynicist in me makes me sceptical if I think someone's is simply on the first peak of Dunning Kruger, but responding as if they were a pro, especially when they make themselves out as a forum spokesperson.
Well, I've built many things that go over 200 MPH with people in them, safely, boats and houses and I am NOT an engineer by trade or education.
Over 70% of the WWII ships that were designed, built and operated by the USA where not designed by a man trained as a Navel Architect or Engineer:

The class of 1910 dropout who designed the SS United States—the fastest, safest, most beautiful transatlantic liner ever built—had the diction of a Philadelphia aristocrat, the mind of an artist, and the mouth of a sailor (a trait picked up from years of working in shipyards).

William Francis Gibbs’s love affair with ships began when the eight-year-old and his father watched the ocean liner St. Louis roar down the ways at Philadelphia’s Cramp Shipyard. “[F]rom that day forward I dedicated my life to ships,” Gibbs recalled. But when he arrived in Cambridge in the fall of 1906, he had no apparent knack for engineering or leadership. Shy, sickly, and terrified of simple addition, he got into Harvard’s Lawrence Scientific School at 20, despite abysmal grades, most likely because of his family’s wealth. His self-made father, who earned millions manufacturing gas equipment with Peter Widener (grandfather of Harry, A.B. 1907), was not happy when his son chose to study engineering. “Most of the engineers he knew,” Gibbs said, “were pretty impractical people.”

The introverted Gibbs was not popular—his rambunctious peers often “filled him with alarm.” He was a prep-school-educated Protestant living in a “Gold Coast” dormitory, but no final club wanted him. Alone in his Claverly suite, he studied blueprints of the newest British naval vessels late into the night. Yet he carefully locked his desk when he left his room, fearing ridicule as “the eeriest of all the eccentrics in three centuries of Harvard life if it were known that he was busy improving British battleships.”
Meanwhile, he proved a bad engineering student, and withdrew from Harvard early in his sophomore year. After a round trip to Europe with his younger brother aboard Cunard’s new liners Lusitania and Mauretania, he returned to Cambridge the following fall, switched to economics in the College, and excelled. Yet he did not graduate: his father went bankrupt, and Gibbs left school.

Eventually he enrolled at Columbia and worked his way through college and law school there. Yet he kept his passion for ship design. “I studied engineering at night out of books,” he recalled. “That’s the way to really learn things—by yourself.” In 1915, the unhappy lawyer finagled his way into an apprenticeship with the nation’s leading naval architect, Admiral David W. Taylor, who led the U.S. Navy’s expansion under Theodore Roosevelt.

Gibbs never looked back, steadily building up his own naval engineering firm and hiring talented subordinates. (“Take it away,” he was known to snarl when shown what he deemed inferior workmanship. “Bring me the best.”) He married the cultured Vera Cravath, whose father was one of the most powerful lawyers in New York. In the 1930s, encouraged by ship enthusiast Franklin Roosevelt, Gibbs designed the revolutionary Mahan-class destroyers, the first combat vessels to use high-pressure, high-temperature steam turbines. Their speed and maneuverability probably helped win the war in the Pacific. During World War II, Gibbs & Cox designed 70 percent of all navy ships, including the Normandy landing craft, and devised a means to mass-produce Liberty Ship cargo vessels faster than the enemy could sink them.

I'd say that that the designation "Engineer" (which until recent times, NASCAR teams would not hire because engineers were frequently being proven wrong when they were saying how something was impossible to do a certain way) just allows you to talk the talk and pretend that you are superior in knowledge. Maybe you do have more knowledge, maybe you do not. Most of us have quit a bit of EMPIRICAL knowledge if not EDUCATIONAL knowledge and many of us have both.
Have you read the FAQ section at the top of the page yet? If not, I kindly and strongly suggest that you do.
But, also I would suggest that you calm down a bit and take RandomEars advice.

We are welcoming you and kindly, from the bottom of our hearts, making these suggestions. And hope that we can all learn something from each other.
Thank you for your consideration.
EJ3
 
Out of interest are you an actual engineer? For the record, and to be clear here I'm a chartered engineer in mechanical engineering, so I work in a professional engineering environment, and the cynicist in me makes me sceptical if I think someone's is simply on the first peak of Dunning Kruger, but responding as if they were a pro, especially when they make themselves out as a forum spokesperson.
Does it matter what my job is, though? Or maybe: Should it? If what I say is correct, it can be challenged and the challenge should fail. If it is incorrect, it should be challenged and the challenge should succeed. Occasionally, I find myself swinging an argument by authority, but I try to avoid it - it may be useful to have a general idea if someone has any knowledge of a topic, but the impression or expectation of knowledge shouldn't be used to augment an argument. Especially not on the internet, where anybody can pretend to be anything they want.

Also, I'm definitely not a spokesperson for the forum. Simply made it a habit to say "Hi!" to new members if I notice their post count. So, hi!
 
In my world "works for Nintendo" automatically ranks higher than "I'm an engineer" even if it's just the janitor. :D
Let there be no misunderstanding. If my dad works for Nintendo, there is no greater authority. On any matter!
 
This is a review and detailed measurements of the Fosi Audio ZD3 balanced stereo DAC. It was sent to me by the company and costs US $179.99.
View attachment 408318
The ZD3 manages at the same time to look elegant/modern and cute! The choice of round display is smart as is displaying the level the largest in the center. Feature set is rich with inclusion of trigger in/out (for powering downstream amp/devices) and HDMI ARC:
View attachment 408320
It is especially nice to have "discrete" buttons on the remote to select inputs. Again, this lends itself to nice automation in addition to being easier to use than going in menus or sequential selection.

Fosi Audio ZD3 Measurements
Starting with balanced output, we immediately see signs of competent implementation:
View attachment 408321

View attachment 408322
View attachment 408323
It easily achieves transparency even in unbalanced output:
View attachment 408324

I am now able to measure HDMI ARC which nicely shows same performance as USB on ZD3:
View attachment 408325

Performance is noise bound. Competitors use 4.2 volt output which uses the best dynamic range of the audio analyzer. If Fosi had done that, it would probably extract another half a dB of SINAD. Here is the dynamic range to indicate that:
View attachment 408326

Performance naturally improves a bit if we go to max output of nearly 5 volts:
View attachment 408327

Multitone performance is excellent and approaches state of the art where our hearing is most sensitive:
View attachment 408329
For compatibility with reviews elsewhere, here is the output with 50 Hz tone driven into unrealistic 600 ohm load:
View attachment 408330

There is some inconsequential jitter components as indicated by spikes near our 12 kHz tone:
View attachment 408331

Likewise, linearity is a hair off in one channel:
View attachment 408332

Only one default filter is provided which is just fine with me:
View attachment 408333
View attachment 408334

We see a hint of ESS DAC IMD Hump which is more than acceptable:
View attachment 408335

Wideband frequency sweep shows excellent response:
View attachment 408336

Conclusions
The ZD3 nails the look and importantly, feature set of what one wants in a low cost DAC. It provides full transparency with excellent noise and distortion. And makes this reviewer happy with such features as single button input selection and large (relatively speaking) volume level display. Company is clearly in tune with its customer needs. Its entrance is enriched by that knowledge and excellent engineering. Really, the growth of Fosi as a company in this desktop category is just amazing.

It is my pleasure to recommend the Fosi ZD3 balanced stereo DAC.
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As always, questions, comments, recommendations, etc. are welcome.

Any donations are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/

Very good devices.
Once again Fosi hits the mark. Performance, appearance, components and price make it truly attractive.
I also like the fact that they have a line, the “Z” that has the same dimensions and physical characteristics, so as to allow a visually ordered and coordinated system. Something that other competitors do not do, producing a myriad of different shapes.

The orange knob adds the finishing touch. In two years Fosi has created a family feeling: its products are recognizable in the endless jungle of devices.

Well done, excellent result. I also like the fact that you can change op-amps. Not so much for the pursuit of a particular sound, but because it allows users to play, learn, understand how things work, open the devices and see them from every point of view.
This thing is almost educational, regardless of the final result. It allows you to have a more complete cognitive experience.

Thanks Amirm as always for the time dedicated and for the test!

Reserved for @AdamG to kindly post the specs.

Manufacturer Specifications:

View attachment 408432
I am considering this DAC for use between a WiiM mini and 2 Fosi V3 monoblocks. Which is preferable, setting the WiiM mini volume to max and using the ZD3 volume control, or set the ZD3 volume to max (or bypass its preamp section, if possible) and use the WiiM volume control?
 
Hello, can anyone share here the 1.07 firmware?
On my zd3 the optical input is not working and I suspect the 1.08 fw.
 
I purchased ZD3 before Christmas, but unfortunately returned and purchased a competition product.
The reason was:
* problem with HDMI and my LG TV - the device was turning on by itself - Fosi would replace the product, but again it had to be sent back to them (in my case the place where I bought it)
* low trigger out current - it would not turn on my power amp.. I did not find the current specified anywhere before purchasing the product, I guess it was it was designed to power on the Fosi amps only
* problem with audio - reading other people reports on this forum, I updated the firmware to (I guess) 1.06, but had to pull out my old Windows laptop for this, i.e. lack of network firmware updates
Other than that, I was pretty happy with it, sound wise and the rest of the stuff. The trigger current was the main problem that made me to return it and purchase something else.
Hi. I also ordered a Fosi Audio ZD3 and I have a question. I want to trigger an external switch module using its 12V trigger out. Primarily I tried to trigger this module using my integrated amplifier, but as I found this trigger module does not trigger due to low current of the 12V trigger out on my integrated amp - only 8.5mA. Can You provide the brand and model of the DAC You purchased to properly trigger Your triggering module?
 
I bought a Fosi Audio ZD3 but I cannot trigger any other device using its Trigger Out. The voltage measured was about 11.4V and when I connected a relay module (same as in https://www.audiosciencereview.com/...ger-module-with-iec-c13-c14-connectors.60647/) nothing happened. I check the current (in mA) but output current was totally 0 mA for DC and something like 0.6 mA AC. Has anybody similar issues with Fosi Audio ZD3? If it works like that this 12V trigger output is a scam as it is unusable with devices other than from Fosi.
 
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