WiiM Amp Pro Firmware v5.2.726630 Update - Aug 18, 2025

Please review the WiiM Amp Pro update release notes below. If you encounter any issues, feel free to reach out to us. This firmware update is being rolled out in stages, with devices updating sequentially over the next few days.

5.2.726630 (In Progress)​

Release date:

8 / 18 / 2025

What's New:

1. Room Correction & EQ Integration: Room Correction and EQ now work together to provide an optimized listening experience. Learn More
2. Stabilized Wi-Fi Connection: Enhanced connection reliability, especially for mesh network environments.
3. Amazon Music: Bitrate information is now displayed when streaming Amazon Music Prime.
4. Sub Pro Intergartion: Improved pairing experience and overall functionality when using the Sub Pro.
5. YouTube Music: Native, seamless streaming support. (requires the upcoming app version 3.3.1).
6. Soundtrack SDK Upgrade: Under-the-hood improvements for a smoother, more consistent listening experience.

Bug Fixes:

1. Alarm Fixes:
   • Resolved an issue where weekly alarms occasionally failed to trigger.
   • Fixed a bug where only the default tone played for Pandora alarm.
2. Dolby Audio Fixes:
   • Fixed no-sound issues when playing Dolby audio in multiroom setups.
   • Corrected volume balance behavior for Dolby audio.
   • Corrected low volume when playing Dolby Digital content.
3. USB Output Fixes:
   • Resolved no-sound issues after reconnecting a USB DAC device when using Google Cast, TIDAL Connect, Spotify Connect, or Qobuz Connect.
   • Fixed audio stuttering when playing at 44.1kHz or 48kHz sample rates.
4. Playing Status: Corrected the playback status indicator when no music is playing.
5. Qobuz: Now displays the correct artist name in the app during playback.
6. Bluetooth Output: Fixed a no-audio issue after switching outputs.
7. NAS & USB Playback: Playback now correctly restarts from the beginning after the last track finishes.
8. Playback Speed: Resolved rare cases where songs played at accelerated speed.

 

[SevenAfterSix]

This new firmware update appears to have fixed a longtime issue I have had with Wi-Fi connection and the music just dropping out. All positive so far!

 

[dominikz]

@WiiM Team So the loudspeaker output inverted polarity issue is not yet fixed in this release? Issue reported in ticket #537669.

 

[slartibartfast]

@WiiM Team So the loudspeaker output inverted polarity issue is not yet fixed in this release? Issue reported in ticket #537669.

I don't suppose you know if the WiiM Amp has the same issue.

 

[dominikz]

I don't suppose you know if the WiiM Amp has the same issue.

No sorry, I don't have it so can't really say for sure.
However, looking at this set of tests by @onlyoneme the WiiM Amp seems to preserve original polarity (i.e. impulse response peak faces upwards).

 

[slartibartfast]

No sorry, I don't have it so can't really say for sure.
However, looking at this set of tests by @onlyoneme the WiiM Amp seems to preserve original polarity (i.e. impulse response peak faces upwards).

Hmm, in that case why do I need to invert my analog sub for best response?

 

[dominikz]

That is difficult to answer unambiguously without measurements. Here's some ideas off the top of my head:

• Could be the analog circuit in the subwoofer itself inverts polarity at some stage.
• Could be the WiiM Amp sub output polarity is inverted.
• Could be some acoustic phenomena around the crossover (on the sub and/or the mains) that modifies the phase sufficiently to cause a cancellation in the summed response.

In any case, it would require step-by-step troubleshooting to determine the cause.

These kind of situations really highlight why it is important to measure the response when integrating a sub - it is the only way to truly optimize the crossover!

 

[slartibartfast]

That is difficult to answer unambiguously without measurements. Here's some ideas off the top of my head:

• Could be the analog circuit in the subwoofer itself inverts polarity at some stage.
• Could be the WiiM Amp sub output polarity is inverted.
• Could be some acoustic phenomena around the crossover (on the sub and/or the mains) that modifies the phase sufficiently to cause a cancellation in the summed response.

In any case, it would require step-by-step troubleshooting to determine the cause.

These kind of situations really highlight why it is important to measure the response when integrating a sub - it is the only way to truly optimize the crossover!

Apologies is this is a daft question but which part of the impulse response would you look at to determine if the phase was correct? I have some old REW mdat files which show an initial positive movement but the next larger peak is negative.