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Speaker Volume Limiting Device

I have some speakers in public places with the Amp+.  

 

There have been a few instances where due to reasons unknown, the volume turned up to maximum in software and it caused quite a ruckus.

The audio comes from via VLC from a network stream, and the volume is adjusted using alsamixer (I also tried to find if there was a max limiter in software, without any luck).

Is there a device that will limit the maximum volume of the output, without impeding (at least significantly) the signal at lower levels?

A straight up potentiometer wouldn't do.

 

I have tried to search for things like the following:

Voltage limiting 

Volume limiting

 

Anyone come across something like this or can help me figure out what path to take to find something, or solve this problem from occurring again?

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