> Is there any way to infer the approximate loudness of a cheap PC speaker 
> from the Wattage rating? I realise that it's quite possible to make an 8W 
> speaker that is deafening, but most manufacturers "typically" don't od 
> this, so... is there any way I can figure out the data I need?

Speaker sensitivity is the parameter you are after, tells you the "loudness" 
in dB 1 metre away from the speaker when you apply 1 Watt of electrical 
power to it.  Typical values are from 80 - 100, so I guess you could use 90 
to work out the dB.  I doubt cheap PC speakers will tell you the actual 
value.

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