This is a review and reduced measurements for WiiM Pro stereo streamer and preamplifier. It is kindly loaned to me by a member and costs US $149.
I didn't mess with the front controls but used the app on my Android phone. The device provides rich set of functionality that is easily exposed through the app.
Level of connectivity is stunning at this price point:
We not only have digital out but also analog input.
I upgraded the unit and connected to it over Ethernet.
WiiM Pro Streamer Measurements
I started with streaming using Roon media player and capturing RCA output at maximum volume:
I am disappointed at high level of second harmonic distortion which pegs SINAD at just 15 bits. Performance is the same as using Toslink:
I like to see a SINAD above 100 dB as to preserve 16 bit content.
Fortunately using Toslink digital out by setting it to 24 bits gives you "bit exact" output:
This means you can use a higher performance DAC and get far better response.
Using analog out, signal to noise ratio is good:
As is jitter although the measurement floor is occupied with fair bit of noise:
The input ADC, as is typical, is not as good as the DAC:
And has that channel delay differential to boot. Switching to digital out did not fix that either:
I think we have good enough picture at this point.
Conclusions
Both the software capabilities and input/outputs are exemplary for any streamer let alone at this price point. This is countered by a DAC that is a notch lower in performance than what I wish to see. Fortunately you can use an external DAC to remedy that (or use another WiiM streamer with a better DAC).
As is, I can't recommend the WiiM Pro streamer. It just fails to reach my minimum bar.
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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/
I didn't mess with the front controls but used the app on my Android phone. The device provides rich set of functionality that is easily exposed through the app.
Level of connectivity is stunning at this price point:
We not only have digital out but also analog input.
I upgraded the unit and connected to it over Ethernet.
WiiM Pro Streamer Measurements
I started with streaming using Roon media player and capturing RCA output at maximum volume:
I am disappointed at high level of second harmonic distortion which pegs SINAD at just 15 bits. Performance is the same as using Toslink:
I like to see a SINAD above 100 dB as to preserve 16 bit content.
Fortunately using Toslink digital out by setting it to 24 bits gives you "bit exact" output:
This means you can use a higher performance DAC and get far better response.
Using analog out, signal to noise ratio is good:
As is jitter although the measurement floor is occupied with fair bit of noise:
The input ADC, as is typical, is not as good as the DAC:
And has that channel delay differential to boot. Switching to digital out did not fix that either:
I think we have good enough picture at this point.
Conclusions
Both the software capabilities and input/outputs are exemplary for any streamer let alone at this price point. This is countered by a DAC that is a notch lower in performance than what I wish to see. Fortunately you can use an external DAC to remedy that (or use another WiiM streamer with a better DAC).
As is, I can't recommend the WiiM Pro streamer. It just fails to reach my minimum bar.
------------
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/
