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<blockquote data-quote="Matt Lillie" data-source="post: 33198" data-attributes="member: 84">Re: Prediction Software&nbsp;Yeah, they&#039;re SPL options within the defined b/w, there are other options for peak, rms, program and &quot;flat&quot;. In theory, you can pick 2k5, 1/3 octave, rms, and get a pretty little curve that shows you graphically what your spl is at whatever distance at that frequency and b/w. OR you could pick broadband, peak, it will spit out a different curve. None of the results, however, as far as I can tell, have anything to do with the actual measured results. I can put on pink w/6dB crest and get a &quot;slow&quot; reading 20 dB off from predicted? Spec sheets have been marketing for years, so now the tools are as well? Try it with some other prediction software, see if the numbers are even close. I could live with, like you say, maybe 3-6 dB margin of error. I&#039;m curious. What does your ADR stuff use? Think about some guy sitting in a cubicle somewhere, specing a system for XYZ install, and the RFQ calls for, let&#039;s say, 105 dBa &quot;program&quot; 100-10k at 75&#039;, even coverage, blah blah blah. Guy puts in the numbers, specs a rig, sells it, installs it, and fires it up. He&#039;s 6 or 10 dB from hitting the spec, based on the numbers provided in a &quot;prediction&quot; program. Hopefully this doesn&#039;t really happen but if it does, who eats the cost of doubling/tripling the rig? There&#039;s probably a disclaimer in the fine print.</blockquote>

[QUOTE="Matt Lillie, post: 33198, member: 84"] Re: Prediction Software Yeah, they're SPL options within the defined b/w, there are other options for peak, rms, program and "flat". In theory, you can pick 2k5, 1/3 octave, rms, and get a pretty little curve that shows you graphically what your spl is at whatever distance at that frequency and b/w. OR you could pick broadband, peak, it will spit out a different curve. None of the results, however, as far as I can tell, have anything to do with the actual measured results. I can put on pink w/6dB crest and get a "slow" reading 20 dB off from predicted? Spec sheets have been marketing for years, so now the tools are as well? Try it with some other prediction software, see if the numbers are even close. I could live with, like you say, maybe 3-6 dB margin of error. I'm curious. What does your ADR stuff use? Think about some guy sitting in a cubicle somewhere, specing a system for XYZ install, and the RFQ calls for, let's say, 105 dBa "program" 100-10k at 75', even coverage, blah blah blah. Guy puts in the numbers, specs a rig, sells it, installs it, and fires it up. He's 6 or 10 dB from hitting the spec, based on the numbers provided in a "prediction" program. Hopefully this doesn't really happen but if it does, who eats the cost of doubling/tripling the rig? There's probably a disclaimer in the fine print. [/QUOTE]

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