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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.

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Acoustics

SPL - Sound Pressure Level

SPL addition

 Ceiling speaker coverage

Time «» Distance

Frequency «» Wavelength Air Absorption
   
Audio Electronics

dBu «» dBV «» Volt

Q «» B/W (bandwidth)

   
Lighting

DMX Channel «» DIPs


SPL (Sound pressure level) calculator

Loudspeaker sensitivity (1W/1m) dB SPL
Amplifier power/speaker W Correction/1W dB
# of speakers
 random phase
 in phase
Correction/1 altavoz dB
Distance to speaker (m=metres, ft=feet)  m  ft Correction/1 m dB

Theoretical (calculated) Total SPL dB SPL

Total Correction

dB

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.

SPL addition

SPL 1 dB SPL
SPL 2 dB SPL
SPL 3 dB SPL
SPL 4 dB SPL
SPL 5 dB SPL
SPL 6 dB SPL
SPL 7 dB SPL
SPL 8 dB SPL
random phase (incoherent sources)
in phase (coherent sources)
Sum dB SPL

Fill in as many fields as required and click on the "Compute button" to get the sum


Ceiling speaker coverage calculator

Loudspeaker coverage angle (beamwidth) degrees
Room height (m = metres, ft = feet) m ft
Listeners are: seated standing up
Coverage, width
Coverage, area (width²) ²

Fill in the first three fields and click on the "Compute" button to get the resulting coverage.
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

Time in milliseconds (ms) or microseconds (us) ms us Distance in metres (m), pies (ft), centimetres (cm) or inches (") m ft  cm "
                 For sound speed of m ft / second

Metres (m)

Total time in seconds:
I.e.:          

Feet (ft)

Seconds +

Centimetres (cm)

Miliseconds +

Inches (")

Microseconds

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

Frequency Hz Distance in metres (m), feet (ft), centimetres (cm) or inches (") m ft  cm "
                 For sound speed of m ft / second

Metres (m)

 

Hz

Feet (ft)

Centimetres (cm)

Inches (")

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

Air temperature in degrees.
Centigrade (Celsius) or Fahrenheit
°C  °F
Relative humidity  %
Frequency  Hz
Attenuation (dB/distance) dB/100 m    dB/100 ft

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

dBu dBV Volts
dBV dBu dBu
Volts Volts dBV

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

B/W
(bandwidth)
 oct Q
Q B/W
(bandwidth)
 oct

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

DMX address (decimal)


1


2


3


4


5


6


7


8


9
ON
 

 

ON

1


2


3


4


5


6


7


8


9
  Decimal DMX address
Binary DMX addresss   Binary DMX address

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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