Re: what does this spec mean?

>Lately I heard that some unscrupulous manufacturers were using the 2.83V
>'standard' also when measuring 4 ohm units, thereby gaining artifically an
>extra 3dB on the sensitivity figure.
>
>Any comments?

I don't see what's unscrupulous about it; the data this spec yields are useful.
If I have two speakers, one 4 ohms and one 8 ohms, both rated at the same
sensitivity (say 92dB at 1 meter, 2.82 V), then they'll play at the same volume
for a given setting of the control room pot. That's useful to know.

It's also useful for the consumer to notice that this is the equivalent of 2W
(well, more or less, since the impedance isn't constant) and do your amp-needed
calculations accordingly.

Peace,
Paul