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|Professional audio and lighting calculators|
To use these calculators, simply fill in the grey fields, select radio button options if needed, and click on "Compute". Use dots (".") as decimal separators. In most cases, results (denoted by fields with green background), get updated automatically when parameters are changed, but do click on the "Compute" button to make absolutely sure the calculation has been performed.
If you wish other sound related Calculators to be added, let us know here. Do not forget to visit other useful sections in Doctor ProAudio such as our vertical Vertical Search Engine (very powerful, search for terms within pro-audio pages of the www), interviews, audio references and the English-Spanish-English pro-audio dictionary.
|Frequency «» Wavelength||Air Absorption|
SPL (Sound pressure level) calculator
Fill in the
first four fields on the left and click on the "Compute" button to get
the theoretical SPL. The column on the right shows the partial correction
relative to the reference conditions of 1 loudspeaker, 1 W and 1 m. Computation
is based on the entered parameters only, and does not include others such as air
propagation losses or loudspeaker power compression). You can compute air
absorption with the Air absorption calculator. Resulting SPL will be RMS
provided the amplifier power is RMS as well, as published by most amplifier
manufacturers. For more than 1 speaker, use the "in phase" option for
subwoofers located next to each other. For the remaining cases, the "random
phase" option will be the closest to the actual number, and in any case we may
be underestimating the SPL somewhat, so any difference will work in our favour.
Fill in as many fields as required within the first four and click on the "Compute button" to get the sum
Ceiling speaker coverage calculator
Fill in the
first three fields and click on the "Compute" button to get the
If vertical and horizontal loudspeaker coverage angles are different, compute each angle separately. Ceiling speakers tend to have a -6 dB coverage angle around 100 degrees and a -10 dB angle of around 140 degrees. Often, the theoretically correct spacing for the -6 dB angle yields too many speakers. In that case you could use the -10 dB angles or multiply the -6 dB angle by a factor
Millisecond/microsecond «» metres/feet/cm/inches calculator
Fill in the first field, select the option and click on the "Compute" button for each term (column). You can also change the default sound speed, 343 m/s (1125 ft/s), which is shared across the two calculations (columns). Sound speed only changes slightly with humidity and temperature. To convert seconds to distance just multiply them by 1000, write the result on the first field and select "ms"
Frequency (Hz) «» wavelength calculator
Fill in the first field, select the option if applicable and click on the "Compute" button for each term (column). You can also change the default sound speed, 343 m/s (1125 ft/s), which is shared across the two calculations (columns). Sound speed only changes slightly with humidity and temperature.
Air absorption calculator
Fill in the first three fields and click on the "Compute" button to calculate absorption of sound by the atmosphere. The method used here is specified on the ISO 9613-1 standard and approximates real-life values within certain value ranges. This value can be added to the loss computed at the SPL Calculator to get the total resulting level. Real-life data in graphical form
dBu «» dBV «» Volt calculator
Fill in the
first field and click on the "Compute" button for each term (column)
dBu refers to 0.775 Volts; sometimes dBv is used instead of dBu. dBu is equal to dBm assuming a 600 ohm load). dBV refers to 1 volt.
Q «» B/W (bandwidth) calculator
Fill in the
first field and click on the "Compute" button for each term (column).
Bandwidth is in octaves. The decimal separator must be ".".
There is no standard way to convert bandwidths to Q factors and a number of formulas exist,
but the calculation above will be useful nevertheless. In tabular form
DMX channel «» MiniDIPs calculator
On the left column, for conversion of a DMX channel (address) to miniDIP switch positions, enter the channel number on the grey field and click on the "Compute" button. The + and - are used to increment or decrement the address number ("Compute" needs to be pressed after that). Results are shown on the green fields. Clicking on a radio button marks it grey for reference.
On the right column (miniDIP to channel number), select the switch positions in grey and click on "Compute" for the resulting DMX address
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