[Don Pearce[_3_]]

On Sun, 21 Apr 2019 15:36:31 -0700 (PDT), wrote:

Mat Nieuwenhoven wrote:



The Celestion data from another response shows the high sensitivity
(98 dB or so), but they don't specify how it is measured.


** Usually with pink noise limited to a particular bandwidth - generally the mid band - but others include the high frequency peak in the measurement to get an extra couple dB.



If the SPL
is measured at 2.84 Volts, then the sensitivity will be less for the
16 Ohm version.



** The spec is for so many dBs *per applied watt* at 1 metre. For an 8ohm speaker this equates to 2.83V rms and for a 16 ohm model 4.0V rms.

Sometimes the makers will use 100mW for their tests as SPLs of 98dB and over are *very* loud.


And they don't show the waterfall spectrum which
shows resonances.


** Be a beautiful sight, full of glorious resonances.


But that might be only important for HiFi.


** Eee yup.



..... Phil


Particularly with pink noise, they have no choice but to apply a
voltage - which is what amplifiers generate. The actual amount of
power that results in is something the speaker has to negotiate with a
deity, cos it certainly isn't negotiable with any human.

When they talk about 1 watt, they are just assuming a nominal
impedance, which for any particular driver over an extended bandwidth
is a fiction.

d