[alsa-devel] What does 0dB refer to? (Logitech USB Speakers)
James at superbug.co.uk
Sat Apr 12 21:34:09 CEST 2008
James Courtier-Dutton wrote:
> Florian Faber wrote:
>> On Saturday 12 April 2008 20:14:44 James Courtier-Dutton wrote:
>>> That sounds reasonable for now. Professional sound card users will
>>> maybe just have to remember to mute the master control before
>>> connecting their speakers.
>> This is very, very dangerous - not only can it harm the equipment, it
>> can also harm the user. 0dBFS equals >121dB at a distance 2m away from
>> my head, and I have a *small* setup.
>> To be honest, I think I would then insert a switch in the RME driver
>> that will enable the outputs only after the RME mixer application has
>> been started.
> Thats not very helpful really.
> What value should we set it to then?
> Another alternative could be to leave everything at 0dB except the master.
> For the master we could select say minimum dB + 12.
> So, if the Master ranged from -70 to 0 dB, we would set Master to -70 +
> 12 = -58dB.
> Would that suit everyone better.
Note this should be set after boot up. All ALSA drivers in the kernel
should still default to muted. Once the value has been set, it is
remember over a reboot and changed from the kernel mutes in a boot up
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