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Low Earth Orbit
DIY Audio
60 Degree DIY Mid Hi - AKA PM60
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<blockquote data-quote="Mark Wilkinson" data-source="post: 148403" data-attributes="member: 8989"><p>Re: 60 Degree DIY Mid Hi</p><p></p><p></p><p></p><p>Thx Bennet, so I take what this means, is that the pink noise crest factor is really a function of whatever confidence interval we are imposing on the data (via hard limiting of the pink peaks I guess?). </p><p></p><p>I'm getting that we choose a crest factor that is designed to replicate crest factors measured (in music), and that 12db works. </p><p> I'm left wondering if maybe 12db works for live sound because the economics of amps and speakers have been, and still are, designed to support 12db, ..........and maybe no more????</p><p>Is there any difference in crest factor between amplified and unamplified music? Or with cinema sound? I see in this Meyer paper that a number of cinema folks use 14db or so. <a href="https://www.meyersound.com/pdf/cinema_technical_papers/cinema_calibration_tech_report.pdf" target="_blank">https://www.meyersound.com/pdf/cinema_technical_papers/cinema_calibration_tech_report.pdf</a></p><p></p><p>This also made me realize I've been confusing crest factor, with average music level vs transients. </p><p>If I'm thinking straight, I now see that crest factor is an <em>instantaneous</em> relationship between a waveform's RMS and peak values. And that avg music level vs transients is time dependent, more like avg RMS to peak RMS. From posts I've read, I'm thinking many of us with lesser experienced have suffered this confusion..</p></blockquote><p></p>
[QUOTE="Mark Wilkinson, post: 148403, member: 8989"] Re: 60 Degree DIY Mid Hi Thx Bennet, so I take what this means, is that the pink noise crest factor is really a function of whatever confidence interval we are imposing on the data (via hard limiting of the pink peaks I guess?). I'm getting that we choose a crest factor that is designed to replicate crest factors measured (in music), and that 12db works. I'm left wondering if maybe 12db works for live sound because the economics of amps and speakers have been, and still are, designed to support 12db, ..........and maybe no more???? Is there any difference in crest factor between amplified and unamplified music? Or with cinema sound? I see in this Meyer paper that a number of cinema folks use 14db or so. [URL]https://www.meyersound.com/pdf/cinema_technical_papers/cinema_calibration_tech_report.pdf[/URL] This also made me realize I've been confusing crest factor, with average music level vs transients. If I'm thinking straight, I now see that crest factor is an [I]instantaneous[/I] relationship between a waveform's RMS and peak values. And that avg music level vs transients is time dependent, more like avg RMS to peak RMS. From posts I've read, I'm thinking many of us with lesser experienced have suffered this confusion.. [/QUOTE]
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