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2. Sound intensity - Wikipedia

   en.wikipedia.org/wiki/Sound_intensity

   I 0 is the reference sound intensity; 1 Np = 1 is the neper; 1 B = ⁠ 1 / 2 ⁠ ln(10) is the bel; 1 dB = ⁠ 1 / 20 ⁠ ln(10) is the decibel. The commonly used reference sound intensity in air is [5] = /. being approximately the lowest sound intensity hearable by an undamaged human ear under room conditions.

3. Guitar tunings - Wikipedia

   en.wikipedia.org/wiki/Guitar_tunings

   String gauge refers to the thickness and diameter of a guitar string, which influences the overall sound and pitch of the guitar depending on the guitar string used. [17] Some alternative tunings are difficult or even impossible to achieve with conventional guitars due to the sets of guitar strings, which have gauges optimized for standard tuning.

4. List of guitar tunings - Wikipedia

   en.wikipedia.org/wiki/List_of_guitar_tunings

   A FuniChar D-616 guitar with a Drop D tuning. It has an unusual additional fretboard that extends onto the headstock. Most guitarists obtain a Drop D tuning by detuning the low E string a tone down. This article contains a list of guitar tunings that supplements the article guitar tunings. In particular, this list contains more examples of open ...

5. Sound reduction index - Wikipedia

   en.wikipedia.org/wiki/Sound_Reduction_Index

   The Sound Reduction Index is expressed in decibels (dB). It is the weighted sound reduction index for a partition or single component only. This is a laboratory-only measurement, which uses knowledge of the relative sizes of the rooms in the test suite, and the reverberation time in the receiving room, and the known level of noise which can pass between the rooms in the suite by other routes ...

6. Sound exposure - Wikipedia

   en.wikipedia.org/wiki/Sound_exposure

   Sound exposure level (SEL) is a logarithmic measure of the sound exposure of a sound relative to a reference value. Sound exposure level, denoted L E and measured in dB , is defined by [ 1 ]

7. A-weighting - Wikipedia

   en.wikipedia.org/wiki/A-weighting

   A graph of the A-, B-, C- and D-weightings across the frequency range 10 Hz – 20 kHz Video illustrating A-weighting by analyzing a sine sweep (contains audio). A-weighting is a form of frequency weighting and the most commonly used of a family of curves defined in the International standard IEC 61672:2003 and various national standards relating to the measurement of sound pressure level. [1]

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9. Weighting filter - Wikipedia

   en.wikipedia.org/wiki/Weighting_filter

   Sound has three basic components, the wavelength, frequency, and speed. In sound measurement, we measure the loudness of the sound in decibels (dB). Decibels are logarithmic with 0 dB as the reference. [1] There are also a range of frequencies that sounds can have. Frequency is the number of times a sine wave repeats itself in a second. [2]