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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: However... posted by AndrewG on June 4, 2000 at 05:23:04:
Andrew:
You are right that sound pressure level has a 20log(i1/i1) relationship, but SPL as it is commonly used represents sound power and follows the same rules for electrical power - ie 10log(p1/p2) as you state. Let me quote from "Hi-Fi Loudspeakers and Enclosures":
"Let us suppose that we have two loudspeakers, both rated at 30 watts, and the *sound pressure levels* (*in italics) are given as 111 dB for one and 108 dB for the second, ...... Now here we have to be careful when we are comparing one dB level with another. Although there is a difference of only 3 dB between the two speakers, one actually represents *twice* the acoustic power. ...... the power delivered by the speaker with the SPL of 108 dB will be half that delivered by the speaker with the SPL of 111 dB." I have never considered SPL as anything other than a power relationship and I think that that is how it is generally regarded.Fred H.
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Follow Ups
- However ... Martin Colloms is wrong - Fred H. 06/4/0015:34:40 06/4/00 (5)
- Re: However ... Martin Colloms is wrong - Sean 16:48:43 06/4/00 (4)
- Re: However ... Martin Colloms is wrong - Fred H. 22:51:55 06/4/00 (0)
- Re: try rec.audio.tech - Mike Bates 20:22:48 06/4/00 (0)
- Re: However ... Martin Colloms is wrong - Jon Risch 20:19:27 06/4/00 (1)
- Thanks for clearing that up...... - Sean 00:06:19 06/5/00 (0)
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