Amp Ultra Volume Limit Setting

[cgustafs17]

I have the Wiim Amp Ultra connected to a couple of Monitor Silver S1 bookshelf speakers. My normal listening volume is in the 30-35 range. A couple of days ago, I accidentally turned the volume up to 100 and nearly blew out my speakers and ears. I found the Max Volume Limit setting in the Wiim Home App, but it doesn't behave as I would like. Instead of setting a ceiling that would limit the volume to the Max Volume Limit, it instead operates as a multiplier with the volume. However, when I tested it, I found that case (i) a volume of 50 and max volume limit of 100 is significantly louder than case (ii) a volume of 100 and a max volume limit of 50.

1) I was wondering how exactly the logic for the max volume limit and volume setting interact.
2) Is there any difference in signal fidelity between case (i) and (ii)?
3) Is there any plan on the roadmap to add a volume ceiling feature so I could have Max Volume Limit = 100 and simply prevent a volume value > 60 (for example).

 

[harkpabst]

Hello and welcome @cgustafs17,

There is no official documentation on the characteristics of the volume control and the volume limit setting. According to some knowledgable member who has measured this the behaviour is different, indeed.

O

Post in thread 'Volume scaling'

Mar 21, 2025

and I found also that both the Volume control and Volume Limit use the same steps

This is not the truth, at least not for the Ultra for example where 90% volume limiter is exactly -6 dBFS but 90% volume control is -3.18 dBFS. I use the convention where full scale sine signal RMS level is 0 dBFS.

• onlyoneme

• 

The volume limit setting results in a linear reduction of 0.6 dB per percentage point, so e.g. a setting of 95% results in a reduction of 3 dB.

The volume scale appears to be non-linear.

 

[Wiimer]

3) Is there any plan on the roadmap to add a volume ceiling feature so I could have Max Volume Limit = 100 and simply prevent a volume value > 60 (for example).

I have not heard of such a plan.

That feature might not be any different from a volume limit after all, but it might be useful as a double lock.
(I have suggested a "default volume setting on startup" several times, but it was never adopted. )

You can post in the request thread in this forum or submit a request ticket in the feedback section of the WiiM app.

#BTW, I set the volume limit to 62% and adjust the volume in the range 80~100% and have never had a single problem.