Noise at Amp Pro wake up

[hgb]

Hi,
Overall very happy of my recent WiiM Amp Pro purchase (which WiFi stability is so much better than on the regular WiiM Amp).
Noticed a quick but clearly audible and systematic pop/noise when waking the unit up from standby mode with a new song.
That stops immediately and only occurs at wake up (not between tracks).
Is anyone experiencing the same? Can this be fixed with a firmware or inherent to the hardware and will be there forever?
Many thanks!

 

[Mr Ee]

Hi,
Overall very happy of my recent WiiM Amp Pro purchase (which WiFi stability is so much better than on the regular WiiM Amp).
Noticed a quick but clearly audible and systematic pop/noise when waking the unit up from standby mode with a new song.
That stops immediately and only occurs at wake up (not between tracks).
Is anyone experiencing the same? Can this be fixed with a firmware or inherent to the hardware and will be there forever?
Many thanks!

Yes, I and others have the same "issue", on power on and off.
Not a wiim specific issue, other amps do this too.

 

[hgb]

Many thanks.
My former Powernode never did that.
So I assume that can’t be fixed and it is a hardware issue (not stable on power up)?

 

[harkpabst]

From reading through the various forums it appears like PFFB implementations are more prone to this and there's no easy way around it. If you can live with this (I can) it's probably best to get used to it.

 

[hgb]

From reading through the various forums it appears like PFFB implementations are more prone to this and there's no easy way around it. If you can live with this (I can) it's probably best to get used to it.

Many thanks. As discussed in another thread it might be considered "normal" for WiiM devices but I still think it is an issue as I read this behavior has been improved via firmware on similar Class-D network amplifiers from other brands, so it seems technically achievable.
Possible firmware-only mitigations (no hardware change) to be considered:

• enforce mute before power-down and after power-up stabilization
• add a short gain ramp (fade-in / fade-out) around standby transitions (50–300 ms)
• slightly extend the soft-mute timing during standby entry/exit

Conscious it is probably complex (otherwise WiiM would have done it from start) but worth digging cause it impacts WiiM perceived quality for a share of users (incl. me). Will do my best to follow-up with the support service in case they can do something

 

[hgb]

Hi all.
Got a response from support: "We will share this with our engineering team to determine whether the issue can be resolved through software optimization".
Doesn't say if and when but at least they are aware. If several of us push for that maybe they will address if they can. Will keep you posted if I learn more