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Loudspeaker Sensitivity
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<blockquote data-quote="Michael John" data-source="post: 82555" data-attributes="member: 830"><p>Re: Loudspeaker Sensitivity</p><p></p><p>Thanks Ivan. Very useful. I'd hoped you would see my post.</p><p></p><p>IEC60268-5 talks about the effective frequency range being the frequency points 10 dB below the average pressure (at least an octave around the most sensitive part of the spectrum). This all being done with a sine tones or a sweep. Note that the effective range is different to the rated frequency range a manufacturer may choose.</p><p></p><p>Separately, the standard talks about calculating sensitivity, for a rated or chosen frequency range, using either pink noise (filtered with 24 dB/oct HPF and LPF to the chosen frequency range) OR integrating 1/3 octave noise measurements in the chosen range. In either case the single number is referred back to 1W/1m. Either of these methods seem reasonable in that they avoid picking the highest point on the graph.</p><p></p><p>From your post, I presume all the numbers you mention are taken from a 1W referred frequency response plot. (e.g.2.83Vrms @ 8ohms.) and this appears different to the IEC60268-5 sensitivity method using pink noise. Is there another standard I should get a copy of? Or does everyone use a 2.83Vrms sine sweep as a defacto standard basis for subsequent calculations?</p><p></p><p>Thanks,</p><p>Michael</p></blockquote><p></p>
[QUOTE="Michael John, post: 82555, member: 830"] Re: Loudspeaker Sensitivity Thanks Ivan. Very useful. I'd hoped you would see my post. IEC60268-5 talks about the effective frequency range being the frequency points 10 dB below the average pressure (at least an octave around the most sensitive part of the spectrum). This all being done with a sine tones or a sweep. Note that the effective range is different to the rated frequency range a manufacturer may choose. Separately, the standard talks about calculating sensitivity, for a rated or chosen frequency range, using either pink noise (filtered with 24 dB/oct HPF and LPF to the chosen frequency range) OR integrating 1/3 octave noise measurements in the chosen range. In either case the single number is referred back to 1W/1m. Either of these methods seem reasonable in that they avoid picking the highest point on the graph. From your post, I presume all the numbers you mention are taken from a 1W referred frequency response plot. (e.g.2.83Vrms @ 8ohms.) and this appears different to the IEC60268-5 sensitivity method using pink noise. Is there another standard I should get a copy of? Or does everyone use a 2.83Vrms sine sweep as a defacto standard basis for subsequent calculations? Thanks, Michael [/QUOTE]
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