Wiim Pro distortion on spdif input

[onlyoneme]

By the streamer, in SW, which can be impacted by the firmware update.

I think I would see results of such resampling in the FFT analysis when capturing the streamer output with a device which locks to the spdif clock, but I did not see any signs of degradation. I'm also able to capture a bit-perfect stream.

 

[onlyoneme]

Let me show something.

That's the recording I've made today using Pro's output and captured over ASRC device:

8 parts, 20 s each of them.

Below is a length comparison after aligning to the end of each part:

First row shows Pros' output when content was played directly on the Pro.
Row 2 - an output of the Pro which was fed with the same content but using its digital input. It's just a beginning of the stream. The length is exactly the same.
Row 3 - one of the parts I've mentioned before, recorded 10 minutes later. The length is exactly the same.
Row 4 - another part. It's substantially shorter.

Part 1, 7, 8 of the whole recording have the length exactly like the first row.
Part 2,3,4,5,6 are shorter and very similar in the length to the last row.

How would you explain this?

 

[BenjaminB]

You won't notice unless you disconnect all audio cables from the Yamaha and plug it into the mains then measure volts AC between the Yamaha case and mains earth. You'll prob see 115V or so. If you touch mains earth with your body and brush the side of your hand over the Yamaha case you may well feel the telltale tingle of 115v AC. If you've got the phonos already connected to downstream equipment then they will bleed the AC away to ground via the phono screen. It's when you have nothing connected and then plug phonos in (with the Yamaha powered up) the potential for sparks occurs. I actually tried to discuss the issue with Yamaha and they said it was 'normal' and denied it was a problem....

Ooops, you are perfectly right. I measured ~ 100 V (in AC mode) at the chassis. Although it was indicated that current is very low (got varying results, and could hardly feel anything while touching), this should not be there at all.
Very strange indeed that Yamaha allowed such a design to be released. Normal it is not.
Oh well, have to find out how I can ground this now.

 

[JVN01]

Ooops, you are perfectly right. I measured ~ 100 V (in AC mode) at the chassis. Although it was indicated that current is very low (got varying results, and could hardly feel anything while touching), this should not be there at all.
Very strange indeed that Yamaha allowed such a design to be released. Normal it is not.
Oh well, have to find out how I can ground this now.

Although the current is indeed low it is enough to generate sparks if you drag an earthed wire across the top of the metal case.. it's also enough to damage the input of other audio gear if you connect it "live" because the phono tip is also at 1/2mains AC potential relative to the equipment input until the phono shield connects....

But we're going off topic from the Wiim spdif distortion issue!

 

[phofman]

@onlyoneme I am sorry I do not understand. Please can you explain more?

 

[onlyoneme]

@onlyoneme I am sorry I do not understand. Please can you explain more?

Which part exactly you do not understand?

 

[phofman]

Playback/capture chains for each of the tracks, and what differences they represent.

 

[onlyoneme]

Playback/capture chains for each of the tracks, and what differences they represent.

First row in the Audacity - Pro's output captured when Pro's input wasn't used. Reference recording was looped and played directly on the Pro. All of those 8 parts are captured with the same length.
Row 2,3,4 - Pro's output captured when Pro's input was used. Reference recording was looped and played on the device connected to the Pro's input. Reference recording parts are captured with the different lengths.
Row 2 - captured at the very beginning of the stream. A length of the captured part is exactly the same as in the row 1.
Row 3,4 - captured 10 minutes later:
row 3 - length is the same as in the row 1. It's for parts 1,7,8
row 4 - length is different. It's for parts 2,3,4,5,6. They are significantly shorter.

 

[_Piotr]

I was planning to feed my LG TV's optical out into a WiiM Pro, so I can either stream music or watch TV using my speakers. Sounds like I might run into issues.

I have LG TV feeding WiiM Pro without any issues at all. My setup looks like this LG B6 -> WiiM Pro -> E50 -> PA5 -> Speakers

 

[Tangband]

I've always used the WXC-50 with my own home built DAC (although the internal DACs sound also good in their own right imo). The WXC-50 hardware is superbly implemented (good selection of inputs and outputs, quality metal case, rotary volume knob, properly implemented power on/off modes etc. The biggest weakness is the dire Musiccast app interface which is clunky and frustrating, hopeless on music search and is unreliable with device detection on network. I stuck with it for several years until the Wiim Pro arrived but with the Wiim spdif issues I'll probably go back to it until/unless Wiim can get the Wiim to play properly with real-world TVs.

One word of caution - the WXC-50 uses an on-board switch mode psu which floats the metal chassis at 1/2 AC mains potential (due to the internal mains filter capacitors connected to the chassis). This means that if you plug a phono lead from the Yamaha into another piece of equipment (eg amp or active speaker) then until the phono shield connects you are injecting 1/2 mains AC into the phono input, with potentially catastrophic results.... grounding the WXC-50 chassis with a separate ground wire solved the problem..

Is the WiiM pro better sounding If used as a digital preamp compared to the less good sound from spdif out with the Yamaha wxc50 using it in preamp mode with volume regulation ?

Vintageflankers review of WiiM pro and spdif out with volume regulation on, shows it has true 24 bit resolution.

 

[silver12]

Any solution about metalic sound. In my case, when I connect TV to my DAC is all OK. When si TV conected to Wiimpro metalic sound apears only in app (netflix, hbo...), when i watch tv is ok...(box).