Guide for Managing Volume and Headroom on the WiiM Mini (Measurements)

[harkpabst]

I have sets of REW created filters entered there individually. How do I do that? Does the non-boost switch take care of it post editing?

No, it doesn't. When transfering filters from REW into the WiiM Home App you're not really using the RoomFit algorithm at all. REW is fully responsible for generating the filters.

Edit: Too slow.

 

[Ruediger]

Currently I use the max. volume method to get headroom back.

But I like the idea to work with an offset instead for RoomFit.

 

[nanook]

Interesting, when I measured in August 2025 (FW 4.8.726839) I got different results with a WiiM Pro Plus:

Volume scaling

Hi, The actual volume scale when Wiim Ultra is not set to fixed volume goes from 0 to 100. Is it possible to set volume scaling with négative range from -99dB (full atténuation) to 0db or + (no atténuation)

forum.wiimhome.com

Does using EQ degrade sound quality in Wiim Pro?

Nobody mentioned autogain, at least not that I've seen - the current EQ overload protection implementation looks like soft knee brickwall limiting to me. I appreciate that some might prefer autogain or manual pregain to this, but note that this kind of implementation has its benefits too...

forum.wiimhome.com

 

[harkpabst]

Interesting, when I measured in August 2025 (FW 4.8.726839) I got different results with a WiiM Pro Plus:

Volume scaling

Hi, The actual volume scale when Wiim Ultra is not set to fixed volume goes from 0 to 100. Is it possible to set volume scaling with négative range from -99dB (full atténuation) to 0db or + (no atténuation)

forum.wiimhome.com

Does using EQ degrade sound quality in Wiim Pro?

Nobody mentioned autogain, at least not that I've seen - the current EQ overload protection implementation looks like soft knee brickwall limiting to me. I appreciate that some might prefer autogain or manual pregain to this, but note that this kind of implementation has its benefits too...

forum.wiimhome.com

Your results were exactly in line with what WiiM forum member @onlyoneme had measured before, so the difference between the Mini and newer devices is probably real.

PS:
Also, I haven't seen the volume responding just to steps of 3 with other WiiM devices. I did some measurements when the WiiM Ultra came out, but not as well structured as @staticV3 did, so I didn't even keep them.

 

[harkpabst]

Currently I use the max. volume method to get headroom back.

But I like the idea to work with an offset instead for RoomFit.

Btw., REW tells you the exact headroom you need in dB for the filters it creates.

If you choose to create this headroom using pre-gain, you can simply dial in the exact value in dB straight away. Substract another 3 dB if you want to be on the safe side regarding inter-sample clipping and you're done.

I prefer the volume limit metgod, because I currently don't use EQ but RoomFit only, so I have to adjust in just one place. But of course, I need to know the equivalent dB value for a given difference in volume percentage.

 

[nanook]

I have made a couple of measurements to understand the compressor/limiter (referred to as "DRC" (Dynamic Range Compression) in the WiiM forum).
Apparently it's a well implemented single-band compressor/limiter.

For those interested:
Post in thread 'WiiM Home App v3.5.7 Update – Apr 21, 2026'
https://forum.wiimhome.com/threads/wiim-home-app-v3-5-7-update-–-apr-21-2026.9621/post-184151

 

[Ruediger]

I have made a couple of measurements to understand the compressor/limiter (referred to as "DRC" (Dynamic Range Compression) in the WiiM forum).
Apparently it's a well implemented single-band compressor/limiter.

Great work!

I see the DRC works better than expected. WiiM already did more than basic work. A good measure for many (average) users to catch the rare cases where they really produce too much gain.

For me the objective shifts a little here. I want to avoid clipping - strike that, now I want to avoid engaging the DRC.

So providing the proper headroom is still a topic.