My WiiM Amp tests

I've added the Amp today as the supported WiiM device, so yes, it should work. Just use current "beta" branch.
 
Hi, first off, thank you for the measurements!

Regarding the high frequency switching noise, you mention that
I've been told that it's related to the PSU and it will be eliminated in the next HW iteration.
Click to expand...
and
it shouldn't bother typical speakers
Click to expand...

But I can't help wondering: since it affects both the speaker output and the sub output, it means it not only affects the amplification circuit, but the whole system…

Shouldn't this kind of HF noise be eliminated by decoupling capacitors at the output of the power supply?

Also, as the RCA inputs are converted to digital (meaning: sampled), can't the HF noise also cause aliasing and degrade the signal in this case?

And "eliminated in the next HW iteration", does it mean simply changing a few capacitor values, or changing the PSU layout at a deeper level? And did you get an estimate of when this would happen?

Edit: also, an ADC (as used by the RCA inputs) works by comparing the input voltage to a fixed reference. Would this fixed reference be affected by the HF noise too?
 
Last edited:
pipomolo42 said:
Hi, first off, thank you for the measurements!

Regarding the high frequency switching noise, you mention that

and


But I can't help wondering: since it affects both the speaker output and the sub output, it means it not only affects the amplification circuit, but the whole system…

Shouldn't this kind of HF noise be eliminated by decoupling capacitors at the output of the power supply?

Also, as the RCA inputs are converted to digital (meaning: sampled), can't the HF noise also cause aliasing and degrade the signal in this case?

And "eliminated in the next HW iteration", does it mean simply changing a few capacitor values, or changing the PSU layout at a deeper level? And did you get an estimate of when this would happen?
Click to expand...
I think there are two things mixed together - a class d amp switching frequency signal which is present on the speaker outputs, and hf signal which is present on the sub out. The last one is related to the PSU and it should be fixed with the next HW iteration.
I don't know what is the reason more precisely, maybe something related to caps as you mentioned it. I'm not a guy with such kind of knowledge.
Analog inputs are not affected, at least not directly.
All I know is the statement, that this issue will be eliminated by hardware changes.
 
onlyoneme said:
And, unfortunately, I do not see a way to switch to HDMI source using http api...
Click to expand...
I just added the HDMI in your mediaplayer.py and it seems to work. I can switch to HDMI in HomeAssistant.

Python: 
SOURCES = {'line-in': 'Analog',
           'optical': 'Toslink',
           'HDMI': 'HDMI'}

SOURCES_MAP = {'-1': 'Idle',
               '0': 'Idle',
               '1': 'Airplay',
               '2': 'DLNA',
               '3': 'Amazon',
                           '4': '???',
               '5': 'Chromecast',
               '10': 'Network',
               '20': 'Network',                   
               '31': 'Spotify',
               '32': 'TIDAL',
                           '33': 'Roon',
                           '34': 'Squeezelite',
               '40': 'Analog',
               '41': 'Bluetooth',
               '43': 'Toslink',                   
               '49': 'HDMI',
               '99': 'Idle'}

SOURCES_IDLE = ['-1', '0', '99']
SOURCES_LIVEIN = ['40', '41', '43']
SOURCES_STREAM = ['1', '2', '3', '4', '5', '10', '20', '33', '34']
SOURCES_CONNECT = ['31', '32']
 
bowser said:
I just added the HDMI in your mediaplayer.py and it seems to work. I can switch to HDMI in HomeAssistant.

Python: 
SOURCES = {'line-in': 'Analog',
           'optical': 'Toslink',
           'HDMI': 'HDMI'}

SOURCES_MAP = {'-1': 'Idle',
               '0': 'Idle',
               '1': 'Airplay',
               '2': 'DLNA',
               '3': 'Amazon',
                           '4': '???',
               '5': 'Chromecast',
               '10': 'Network',
               '20': 'Network',                 
               '31': 'Spotify',
               '32': 'TIDAL',
                           '33': 'Roon',
                           '34': 'Squeezelite',
               '40': 'Analog',
               '41': 'Bluetooth',
               '43': 'Toslink',                 
               '49': 'HDMI',
               '99': 'Idle'}

SOURCES_IDLE = ['-1', '0', '99']
SOURCES_LIVEIN = ['40', '41', '43']
SOURCES_STREAM = ['1', '2', '3', '4', '5', '10', '20', '33', '34']
SOURCES_CONNECT = ['31', '32']
Click to expand...
Interesting! I was calling setPlayerCmd:switchmode:HDMI for testing purposes and switching was not working for me.

It's clear now, switchmode parameters are case sensitive and I was using 'hdmi' obviously.
 
Head_Unit said:
Could this be related to
"Turning off an HDMI-connected Samsung ‘The Frame’ TV shuts off sound to the loudspeakers (as we’d expect) but a low-level randomised ‘put-put-put’ sound (noise interference?) continues to spill from the KEF KC62 subwoofer. I have to switch the WiiM AMP over to another input to make it stop...This subwoofer ‘noise interference’ also shows up sometimes – but not always – after having used the TOSLINK input." from
https://darko.audio/2023/11/wiim-amp-review-flying-high-on-value-for-money/
Click to expand...
I also have this issue with subwoofer 'put put' random interference when shutting off HDMI connected TV. For me it is rather loud, perhaps due to running the subwoofer on max volume. I have the latest firmware update as far as I know: 5.0.540148. I submitted a ticket: 495499. This is my biggest issue with the amp so far.
Was this fixed by the first firmware update?
Click to expand...
 
egOscar said:
I also have this issue with subwoofer 'put put' random interference when shutting off HDMI connected TV. For me it is rather loud, perhaps due to running the subwoofer on max volume. I have the latest firmware update as far as I know: 5.0.540148. I submitted a ticket: 495499. This is my biggest issue with the amp so far.
Click to expand...
I'm experiencing the same issue. Started after 5.0.540148 upgrade.
 
Hi Team,

It appears that the recent firmware update may be causing the 'put-put' noise when HDMI is turned off. To address this, could you please submit a ticket through the WiiM Home App? We'll promptly issue a fix to your device. After applying the fix, we'd be grateful if you could confirm whether the issue is resolved in your specific scenario. Your assistance is invaluable to us, and we appreciate your continued support.
 
WiiM Support said:
Hi Team,

It appears that the recent firmware update may be causing the 'put-put' noise when HDMI is turned off. To address this, could you please submit a ticket through the WiiM Home App? We'll promptly issue a fix to your device. After applying the fix, we'd be grateful if you could confirm whether the issue is resolved in your specific scenario. Your assistance is invaluable to us, and we appreciate your continued support.
Click to expand...
Done
 
Looks like "PCB_version": "4" unit has appeared, according to the report on ASR. Mine is "2".
 
onlyoneme said:
I would guess it's somewhat improved at least. The second revision of the Pro Plus got increased PCB_version.
Click to expand...
I see the post now. Sounds like they are also still having some minor coil whine on their version "4". Hmm.
 
I’ve posted this question in its own thread, but I thought posting it here might alert those who know their measurements and can do the sums.

Would the WiiM amp be able to drive a pair of Revel M106 speakers? Used in a room 3m x 5m, but at a distance of around 1.25m. I never listen at ear-bleeding loud levels.

WiiM Amp spec:

Specs for WiiM Amp | WiiM

www.wiimhome.com www.wiimhome.com

Revel M106 spec:

M106 | 2-Way Bookshelf Monitor Loudspeaker

Performa3 bookshelf loudspeakers are true full-range loudspeakers that blend-in easily with your existing décor. They deliver an impressive combination of wide frequency range, uncompressed dynamic range and low distortion across the entire audible spectrum.
www.revelspeakers.com www.revelspeakers.com

Many thanks.
 
Steve Woodhouse said:
I’ve posted this question in its own thread, but I thought posting it here might alert those who know their measurements and can do the sums.

Would the WiiM amp be able to drive a pair of Revel M106 speakers? Used in a room 3m x 5m, but at a distance of around 1.25m. I never listen at ear-bleeding loud levels.

WiiM Amp spec:

Specs for WiiM Amp | WiiM

www.wiimhome.com www.wiimhome.com

Revel M106 spec:

M106 | 2-Way Bookshelf Monitor Loudspeaker

Performa3 bookshelf loudspeakers are true full-range loudspeakers that blend-in easily with your existing décor. They deliver an impressive combination of wide frequency range, uncompressed dynamic range and low distortion across the entire audible spectrum.
www.revelspeakers.com www.revelspeakers.com

Many thanks.
Click to expand...
They’re 8ohm speakers so i don’t see an issue
 
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