When the bit or sampling rate changes, the first 1-2 seconds of the song are cut off.

[byul0615]

The Ultra screen and WHA show up to 198 kHz, not 48 kHz fixed.

Android phones including Galaxy do not output Apple Music as bit perfect even when played via UAPP, so they resample certain sampling rates and output them.
I understand that they do not output properly, such as 44.1 to 48, or 96 to 48, and then 192 to 192.
However, this is not from my own experience, but from Googling, so it may not be accurate.
Thank you for your answer.

 

[byul0615]

In my case, I was using an iPhone with Lightning port, so I used the Apple Camera adapter and a USB A to USB C adapter, then the Cubilux USB C to Optical adapter, and finally optical connection to WiiM Amp.

I also used an iPad with USB C port, and connected the Cubilux USB C to Optical adapter, and then optical to the Amp.

In both cases I was using Apple Music, and never had any issues with sample rates changing between tracks.

You're saying that the amplifier doesn't re-lock even when the bit or sampling rate of the source device changes.
It's a bit strange that it re-locks or doesn't depending on the DDC.
Anyway, thank you for the detailed answer.

 

[dominikz]

I am listening to Apple Music high-resolution lossless sound source by optically connecting the source device (iPhone 15) to WiiM AMP via DDC (SMSL PO100).
As you all know, even if you set it to high-resolution lossless, depending on the sound quality of the released sound source, 24bit 192khz (almost none), 96khz, 48khz, 44.1khz, and even 16bit sound source are played.
As a result, when the current song ends and the next song is played and the bit or sampling rate changes, the first 1-2 seconds of the song do not play and skip.
I sent a ticket with the above symptom, and they checked my log and confirmed that the above symptom occurs when the sampling rate changes in the DDC, and told me to find a way to fix the sampling rate in the DDC.(In their words, this is because the WiiM AMP re-locks the sampling rate.)
However, I connected my iPhone to WiiM AMP using DDC in order to listen to high-quality sound sources with bitperfect (iPhone, iPad only, not Mac), and even if it were possible to fix the sampling rate (which is impossible because DDC does not have such a setting anyway), I don't think it would solve the fundamental problem because upsampling or downsampling would occur, and I don't plan on doing so.
And isn't it the source device that changes the bit and sampling rate, not the DDC?
This is my first passive speaker system, so I have little knowledge about amps, sources, sampling rates, etc.
I'm wondering if this is a problem that can be solved by changing the DDC, or if it's an unavoidable symptom since the WiiM AMP goes through a process called re-lock when the bitrate or sampling rate is changed in any way.
It's been about 2 weeks since they last contacted me about purchasing and testing a DDC (SMSL PO100), if anyone has had experience with or resolved this situation please advise.

It is a bit off-topic perhaps, but may I ask why you prefer to use a DDC to physically connect your phone to the WiiM Amp optical input, rather than just streaming directly to the Amp via the network (i.e. Ethernet or WiFi)?

In both cases you get equally "bit perfect" digital transmission to the Amp, and network streaming is IMHO much more convenient.

Perhaps you are using some kind of player and/or streaming service which is not supported natively by the WiiM Home App?

EDIT: OK, just saw your reasoning in one of the previous posts - sorry for a redundant question! I have no experience with Apple Music so sadly can't help.

Android phones including Galaxy do not output Apple Music as bit perfect even when played via UAPP, so they resample certain sampling rates and output them.
I understand that they do not output properly, such as 44.1 to 48, or 96 to 48, and then 192 to 192.
However, this is not from my own experience, but from Googling, so it may not be accurate.
Thank you for your answer.

 

[Wiimer]

Ah, if it's Android... bit perfect isn't possible yet, right?
I understand that it's output after resampling (probably 48khz in case of wired connection?).
If so, it seems like a slightly different case from mine.

Yes, I was able to reproduce your problem. Sorry, but I take back my previous statement.

I just started using Apple Music this week and didn't realize it. When I play a playlist with tracks of different sample rates, the first 2 seconds of the track does indeed drop.


View attachment c719ca52-1d8e-4470-b657-b44e376f7866-1_all_13138.mp4

However, in my case, the drop does not occur between all tracks with different sample rates. Some tracks do not drop.

 

[byul0615]

It is a bit off-topic perhaps, but may I ask why you prefer to use a DDC to physically connect your phone to the WiiM Amp optical input, rather than just streaming directly to the Amp via the network (i.e. Ethernet or WiFi)?

In both cases you get equally "bit perfect" digital transmission to the Amp, and network streaming is IMHO much more convenient.

Perhaps you are using some kind of player and/or streaming service which is not supported natively by the WiiM Home App?

I would like to take that much easier method, but Apple Music doesn't support streaming from WiiM (or any other service), and AirPlay 2 is not even worth mentioning.
Tidal and Qobuz are not officially available in my country (South Korea) (although there are ways around it).
The simplest way for me to listen to high-quality sound sources, as of now, is to connect my iPhone directly to the amplifier via optical connection and play Apple Music.

 

[rccarguy]

I'm not missing two seconds of audio on every track frequency change. Ultra going into a tonewinner AT300 AV pre amp via digital. Could also try analogue

 

[byul0615]

Yes, I was able to reproduce your problem. Sorry, but I take back my previous statement.

I just started using Apple Music this week and didn't realize it. When I play a playlist with tracks of different sample rates, the first 2 seconds of the track does indeed drop.


View attachment 19643

However, in my case, the drop does not occur between all tracks with different sample rates. Some tracks do not drop.

Thank you for testing it yourself and sharing the video.
It's ambiguous because there are people who said they didn't have this problem (who use the same DDC as you).
Anyway, I confirmed that the amplifier re-locks when the bit rate or sampling rate changes (even if not always) on Android or iPhone.

 

[byul0615]

I'm not missing two seconds of audio on every track frequency change. Ultra going into a tonewinner AT300 AV pre amp via digital. Could also try analogue

It looks like a very expensive preamp, but I don't know anything about the product.
Does this mean that there will be no interruption due to sampling rate changes when playing music with a direct optical connection to the source device like mine?
Or are you talking about other methods of playing music, such as network streaming?
I think the sampling rate for line input is fixed in the WiiM Home app, so I don't think I will be using that method for now.

 

[rccarguy]

It looks like a very expensive preamp, but I don't know anything about the product.
Does this mean that there will be no interruption due to sampling rate changes when playing music with a direct optical connection to the source device like mine?
Or are you talking about other methods of playing music, such as network streaming?
I think the sampling rate for line input is fixed in the WiiM Home app, so I don't think I will be using that method for now.

It's not a very expensive av pre amp, it's probably one of the most affordable av pres out there. Checkout the 32 channel Trinnov!

Through digital there is some interruption / (very low level) digital noise for a tiny fraction of time, Wiim Ultra, but the lock on is pretty quick. It probably depends on the source and av pre/dac, frequency/bitrate change. If you're just playing a whole album or random music but of the same bitrate/ frequency there is no audio drop out.

I do know with the Squeezeboxes has the option of a "always on" type signal, however my stereo DAC does click through a relay (mutes the circuit) when changing from one to the other, ie 44 to 48, or 96khz. So there is loss of signal for split second but no chance of any digital noise.

I do stream through the network, Pi5 as LMS server with music on a NAS. Wired ethernet for streamer, Pi5, and NAS.

 

[byul0615]

As a newbie, I don't understand half of the content.
Anyway, I don't know if I should understand that the sound loss that I felt occurs when the bit rate and sampling rate change during optical connection.
As for network streaming, I have almost no experience with it except for Spotify Connect and Tidal Connect, so I think I need to learn more step by step.
Even from what you said, I still don't understand whether or not there is sound loss when the bit rate and sampling rate change during network streaming.
Anyway, thank you for leaving a detailed answer.

 

[rccarguy]

As a newbie, I don't understand half of the content.
Anyway, I don't know if I should understand that the sound loss that I felt occurs when the bit rate and sampling rate change during optical connection.
As for network streaming, I have almost no experience with it except for Spotify Connect and Tidal Connect, so I think I need to learn more step by step.
Even from what you said, I still don't understand whether or not there is sound loss when the bit rate and sampling rate change during network streaming.
Anyway, thank you for leaving a detailed answer.

The problem is the issue could be an external one to the source, ie how your DAC handles it, how the data is sent during frequency change

Just testing, going from 44khz to 192khz, very low noise bzzt and a drop of audio for about a quarter of a second.

 

[byul0615]

As I wrote in the above posts, in my case the DAC is internal to the WiiM AMP, and I sent the ticket in the hopes that if it's a problem with the DAC, it will be resolved with a firmware update.
If the DDC used to connect the source device and the WiiM AMP is the cause, it may be a problem with that product, but I confirmed through other answers that the same symptom (1-2 seconds lost at the beginning of the song) occurs in DDCs other than my SMSL PO100.(Of course, I also heard that the problem did not occur with the same settings as mine.)
You tested it with network streaming, right?
If it's 1/4 second, I don't think it's noticeable, but it seems that sound loss still occurs.
Thank you again for going through the troublesome test.

 

[rccarguy]

I just tested analogue out from the wiim into the tonewinnner, from 16 bit to 24 bit 192khz, then 192khz to 44 track...no drop in audio, no digital noise.

I'm using LMS

 

[byul0615]

You said you used Ultra as a network player and Tonewinner as a preamp and DAC, and connected them with line input/output?
LMS seems to be a server concept, but I don't know what it is. It's hard to follow.
Anyway, I think it's okay to understand that the problem I'm experiencing doesn't occur with network streaming.

 

[rccarguy]

Whether it's local via USB or over network shouldn't make a difference.

Tried
Ultra digital out into AT300 (coaxial) short loss of sound, very low digital noise. AT300 is acting as a DAC and pre amp
Ultra analogue out into AT300 analogue input, no loss of sound. AT300 acting as pre amp

LMS is a server, basically same as Mediamonkey/minimserver/Plex etc.

 

[Wiimer]

Whether it's local via USB or over network shouldn't make a difference.

Tried
Ultra digital out into AT300 (coaxial) short loss of sound, very low digital noise. AT300 is acting as a DAC and pre amp
Ultra analogue out into AT300 analogue input, no loss of sound. AT300 acting as pre amp

LMS is a server, basically same as Mediamonkey/minimserver/Plex etc.

So you are saying that you did not do any Apple Music testing with the phone connected to DDC and Ultra's Optical input?

 

[rccarguy]

lol I don't have apple music or a DDC whatever that is

 

[Pragmatist]

https://www.reddit.com/r/AppleMusic/comments/1bl2v1u/skips_at_the_beginning_of_apple_music_songs

 

[byul0615]

https://www.reddit.com/r/AppleMusic/comments/1bl2v1u/skips_at_the_beginning_of_apple_music_songs

This is a different case than the one you linked.
I tested it several times and the problem only occurred when I optically connected my iPhone to the WiiM AMP via DDC.