What does Nominal Impedance mean?

@ozzy,

I think nominal impedance means the industry standard. Impedance should not fluctuate more then 8 or 9% from the standard. I.E. An 8Ohm speaker should be no less then 6Ohms, a 4Ohm speaker should be no less then 3Ohms, if they follow the standard.

Mike

I vaguely remember that the speaker industry standard rating of impedance as what it is at 1000Hz.  Which is kind of silly because the impedance is usually all over the place unless the speakers use series crossovers.

ditusa,

Your explanation makes sense and seems to concur with what I read. (somewhere).

ozzy

@clearthinker Wrote:

This poor manufacturer behaviour is mirrored by not quoting a dB range when specifying low frequency extension, and by over-stating sensitivity, which occurs very often.

(Proper) measurements matter.

I agree 110%! See the manual below of my speakers, it's the most comprehensive speaker manual of specifications I known of. They even explain how they arrive at their numbers. See last page specifications:

Mike

https://www.lansingheritage.org/html/jbl/specs/pro-speakers/1984-4430-35.htm

@fritzspeaks Wrote:

I vaguely remember that the speaker industry standard rating of impedance as what it is at 1000Hz.

JBL’s impedance graph is from 20Hz to 2KHz conforming to international standard IEC. International Electrotechnical Commission - Wikipedia

Mike