My WiiM Pro Plus (+) tests

If find the coffee filter is the most beneficial 🤣 🤣🤣
You should admit that the "awareness" of one solution that is formally better than another, recognizable or not at a glance, takes to more peaceful mood, better if with a good coffee taste in mouth...
 
Last edited:
There is a limit of 10 attachments included... How can I write my review without graphs? :(
 
That is why, in the absence of a clear sign, I defaulted to the most mathematically correct solution - "Linear fast rolloff". See http://archimago.blogspot.com/2022/06/review-smsl-do100-dac-dual-ess.html and the aforementioned https://www.audioreviews.org/reconstruction_filters_dummies/
I did just like you did choosing “Fast Linear”. By the way it’s the default filter of my SMSL 500 MKIII.
However i would add that if someone changed my filter without my knowledge i would never realize it ;)
 
@onlyoneme . Can you explain the concepts of intermodulation distortion and harmonics and then make the connection to the measurements especially to the part that you mention that lower frequency harmonics are higher than expected.
 
@onlyoneme . Can you explain the concepts of intermodulation distortion and harmonics and then make the connection to the measurements especially to the part that you mention that lower frequency harmonics are higher than expected.
Harmonic distortions are unwanted effects of the single tone, with the frequencies being integer multiplications of the fundamental one.
IMDs happens with multitones and have frequencies being sums or differences of base tones.
Those mentioned harmonics are based on the 60 Hz fundamental, which is a part of the SMPTE IMD test, but these ones are not IMDs. They would be visible also for a single sine signal of low frequency. I was a bit surprised with the level of those harmonics, in a perfect scenario they shouldn't exist there at all.
 
Harmonic distortions are unwanted effects of the single tone, with the frequencies being integer multiplications of the fundamental one.
IMDs happens with multitones and have frequencies being sums or differences of base tones.
Those mentioned harmonics are based on the 60 Hz fundamental, which is a part of the SMPTE IMD test, but these ones are not IMDs. They would be visible also for a single sine signal of low frequency. I was a bit surprised with the level of those harmonics, in a perfect scenario they shouldn't exist there at all.
What is the level of 60hz harmonics in a single sine signal for your Rme dac? Are they existent ?
 
it's a bit of the interest of the pre-series... can be question the akm support teams to understand, see improved , what happens at low frequencies...??
;-)
 
I've no idea, I'm not an electronics guy, how some undesired behaviors are handled. Is a DAC chip responsible for it, or maybe it's an analog section design. Anyway, low freq harmonics could work better.
 
I have read that all dacs exhibit more or less harmonics as integer multiples of 60hz which is a byproduct ( side effect) of dac conversion . They add distortion but it is not absolute that they are always harmful to sound quality . It depends on how high the harmonic content and also on the structure of harmonics ( odd harmonics vs even harmonics ) . But sure the lowest they are the more correct the signal output is.
 
Back
Top