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Average RMS Power

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chris lloyd
Average RMS Power
on Sep 28, 2008 at 7:18:24 am

Could some please explain to me what Average RMS Power is in the statiscal analysis of adobe audition? the program suggest using this as the best measure of loudness.

Thanks

Chris


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Emmett Andrews
Re: Average RMS Power
on Oct 1, 2008 at 7:17:39 am

Root x Mean ^2 (root mean squared). It's the average level. Audition's meters are peak meters. Normal analog meters are RMS meters and their behavior most closely resembles human hearing of levels. There are a few manufacturers that make meters specifically for measuring percieved loudness, but they're very expensive and not *much* different than RMS.

Emmett



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chris lloyd
Re: Average RMS Power
on Oct 1, 2008 at 7:48:02 am

Thanks Emmett



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chris lloyd
Re: Average RMS Power
on Oct 2, 2008 at 2:32:34 am

My next questions are about how to interpret the Average RMS power statistic. What does -33.47 dB, actually mean? And what is louder
-33.47 dB or -35.35 dB?

Thanks

Chris


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Emmett Andrews
Re: Average RMS Power
on Oct 4, 2008 at 2:30:14 am

The scale (digital full-scale or dBFS) ranges up to 0dB. For a 16-bit file, the range is -96dB to 0 dB with 0 being the loudest and -96dB being the softest. 24-bit ranges from -144dB to 0 dB. Peaks can go all the way up to, but not exceed 0db. The closer to 0, the louder the file, but you would never have a file that is 0dB RMS, as it wouldn't sound like anything. Most commercial CDs fall between -10 and -15dB RMS. Mastering engineers use compression and brickwall limiting to raise the RMS level without allowing peaks to exceed 0dB.

Emmett



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