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<blockquote data-quote="Michael John" data-source="post: 82561" data-attributes="member: 830">Re: Loudspeaker SensitivityThanks again Ivan.Yes, I&#039;m aware of the amps being essentially a voltage device, the use of fixed voltage 2.83Vrms (not power) and the use of nominal impedance, rather than average or min. (IEC60268-5 specifically calls this out saying that for a rated nominal impedance, the measured impedance shouldn&#039;t drop below 80% of the nominal. In other words if the measured is lower, the rated nominal should be changed.)Considering the fixed applied voltage of 2.83Vrms; it could refer to the RMS of noise, tones or a tone sweep. From your posts and others sources I read, people often seem to be using a tone sweep and calculating everything from that. However IEC60268-5 specifically talks about using pink noise (albiet band limited to the frequency range of choice) to calculate a single sensitivity number. The two methods mathematically will lead to different results. How different, I don&#039;t know.So I&#039;m wondering is there a IEC or AES standard that specifically describes measuring sensitivity close to the methods manufacturers are using? Or is everyone using a similar and reasonable defacto standard?Yep, I hear you re the 6 ohms. In some of our cinema software tools, I added the ability to interpolate between an amp&#039;s 2/4/8/16 wattage numbers for speaker arrays where the combined parallel/series impedance would be non-standard. Little things like this really help. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":-)" title="Smile&nbsp; &nbsp; :-)"&nbsp; data-smilie="1"data-shortname=":-)" /></blockquote>

[QUOTE="Michael John, post: 82561, member: 830"] Re: Loudspeaker Sensitivity Thanks again Ivan. Yes, I'm aware of the amps being essentially a voltage device, the use of fixed voltage 2.83Vrms (not power) and the use of nominal impedance, rather than average or min. (IEC60268-5 specifically calls this out saying that for a rated nominal impedance, the measured impedance shouldn't drop below 80% of the nominal. In other words if the measured is lower, the rated nominal should be changed.) Considering the fixed applied voltage of 2.83Vrms; it could refer to the RMS of noise, tones or a tone sweep. From your posts and others sources I read, people often seem to be using a tone sweep and calculating everything from that. However IEC60268-5 specifically talks about using pink noise (albiet band limited to the frequency range of choice) to calculate a single sensitivity number. The two methods mathematically will lead to different results. How different, I don't know. So I'm wondering is there a IEC or AES standard that specifically describes measuring sensitivity close to the methods manufacturers are using? Or is everyone using a similar and reasonable defacto standard? Yep, I hear you re the 6 ohms. In some of our cinema software tools, I added the ability to interpolate between an amp's 2/4/8/16 wattage numbers for speaker arrays where the combined parallel/series impedance would be non-standard. Little things like this really help. :-) [/QUOTE]

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