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Post subject: Re: Speaker efficiency
Posted: Sat Feb 15, 2014 12:45 am
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bluesky636 wrote:
01GT eibach wrote:
bluesky636 wrote:
Sorry. But you are wrong ... 100 dB SPL to 110 dB SPL (a 10 dB increase in SPL) is double the loudness. You need to do some more research.

I don't agree. I think the problem is that correlations are being made between changes in electrical power (watts) and SPL changes (dB). I am not considering input wattages at all, and how much input power it took to make the 3 dB increase in SPL to occur. This is why -- as we all know -- a 100w amp is not twice as loud as a 50w amp.

So ... staying only in the SPL world for a minute, the math is pretty straightforward:

10 * log10 (2) = 3.01 dB, where 2 is the double in SPL (sound power)

If that is not right, then what am I missing?


Read all of this for a complete explanation:

http://www.sengpielaudio.com/calculator-levelchange.htm


Back to my above question, looks like we perceive adding 3dB like 23% increase in the loudness we hear. :lol: :lol:


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Post subject: Re: Speaker efficiency
Posted: Tue Feb 18, 2014 10:54 am
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very heavy thread 8)

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Post subject: Re: Speaker efficiency
Posted: Tue Feb 18, 2014 4:24 pm
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So I asked the question in a previous post "what am I missing"?

Quoted from the above link: "The doubling of the 'loudness impression' will require an increase of SPL (sound pressure level) of about 10 dB."

Therefore, I think the missing part here is that an assumption is being made on my part (incorrectly, evidently) that a doubling of SPL is a doubling of what we interpret as volume. Hence, the human ear does not interpret changes in "perceived" loudness in a linear fashion with how the SPL changes.

So, something was learned here (at least on my part). But I will leave the further equation dissection to the sound engineers. Thanks...

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Post subject: Re: Speaker efficiency
Posted: Tue Feb 18, 2014 10:25 pm
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Don't leave it to engineers, they'll kill us all! :shock: :lol:

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Post subject: Re: Speaker efficiency
Posted: Wed Feb 19, 2014 12:05 pm
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Solid Body Love Songs wrote:
very heavy thread 8)

The thread title should include a "Math Warning!"

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Post subject: Re: Speaker efficiency
Posted: Thu Feb 20, 2014 8:27 am
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Drew365 wrote:
Solid Body Love Songs wrote:
very heavy thread 8)

The thread title should include a "Math Warning!"


Science of sound..


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