[Don Pearce[_3_]]

On Mon, 22 Apr 2019 19:31:17 -0700 (PDT), wrote:

Don Pearce wrote:



A true RMS current meter doesn't help, unfortunately. A speaker's
impedance is very reactive so multiplying RMS current and voltage
doesn't give you power.



** Of course, but what you actually do is multiply the rms noise current SQUARED by the voice coil resistance to get the heat dissipation in the copper wire in watts.

If you find the minimum impedance of the driver with a sine wave test in the mid band, then that number can be used instead of the copper resistance to give an accurate power dissipation figure, including suspension and eddy current losses.



That would need some sort of measurement
system that could provide vector products. As for doing that with a
noise source, forget it.


** A wind band power meter will do the job, analogue multiplying or digital sampling.



So no, you can't measure pink noise power into a speaker.


** Of course you can.



.... Phil



Nope. Didn't understand a word of that.

d