WiiM Amp Pro Speaker pop

[DarrenH]

Hi all,

When I start the WiiM Amp Pro i get a minor speaker crack. I’ve tried this on 2 different sets of speakers and using different speaker cables with the same result. Speakers are Definitive Technology D7’s and Scansonic HD M20’s. No issues during playback or if switching between audio sources.

Any thoughts?

Thanks.

 

[HansD-NL]

That's a known "feature", nothing to worry about. When there are big thumps on power on/off or crackling while playing then it's time for concerns.

 

[hgb]

Hi,
That has been discussed in other threads and apparently it is considered "normal" pops for WiiM devices.
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