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SPL-Power-Calculator
Calculation of the sound pressure level and power at a specific listening distance.
Calculate Amplifier Power for SPL & Distance
How much power do speakers need to reach a desired sound pressure level at the listening distance?
This calculator determines the required amplifier power.
It also calculates the max sound pressure level and SPL over distance.
Further explanations can be found below the calculator.
| Speaker Specifications | ||||
| SPL 1W/1m: | dB | Type: | ||
| Impedance: | Ohm | Subwoofers: | Pcs. | |
| Power Handling: | W | SPL matches half-space (Sub) | ||
| Subs wired in series | ||||
| Line Source | ||||
| Array Length: | cm | Array Freq: | Hz | |
| Listening Position Parameters | ||||
| Desired SPL | dB | Floor | ||
| Listening Dist. | cm | Rear Wall | ||
| Additional Dynamic | dB | Side Wall | ||
| Realistic Boundary | ||||
| Calculated Values | ||||
| SPL 1m: | dB | Power RMS: | W | |
| SPL Dist.: | dB | At Impedance: | Ohm | |
| MAX SPL 1m: | dB | Power incl. Dyn.: | W | |
| MAX SPL Dist.: | dB | Vrms (+Dyn): | V | |
| Crest: | Headroom: | dB | ||
| +dB from Boundary: | dB | Vpeak (+Dyn): | Vp | |
| Array Boundary: | m | Boundary f/3: | m | |
| Notice: | Notice: | |||
Sensitivity Converter |
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| Voltage | Impedance | Result | ||
| V | Ω | W | ||
| Level | Distance | |||
| dB | Mtr. | dB 1W/1m | ||
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Explanation:
General Info |
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Additional options in Purple are for Subwoofers only (Dropdown). The boxes for Boundary loading are only evaluated for subwoofers. Additional options in Blue are for Tops/Fullrange only (Dropdown). |
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Speaker Specifications |
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| SPL 1W/1m | The standard sensitivity at 1W at 1 meter. Note the voltage specification in the datasheet: if a 4 Ohm subwoofer was measured at 2.83V/1m, this already corresponds to 2W/1m. |
| Impedance | The nominal impedance of the loudspeaker. For more precise results, you are welcome to enter Zmin instead. |
| Power Handling | The electrical power handling is specified in RMS or AES. |
| SPL matches Half-Space |
Often the sensitivity of subwoofers is specified in half-space (2pi). This calculator automatically subtracts those common 6dB from the sensitivity value. If a boundary condition is selected during setup, it will be added back. |
| Subs in Series |
Subwoofers wired in parallel or in series. |
| Line Source |
Activate when using a line array or column speaker. Requires inputting the total length of the array and the associated coupling frequency to calculate the nearfield extension. |
Listening Position |
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| Desired SPL | The target sound pressure level requested for the calculation. |
| Listening Dist. | The specific distance at which the system will be evaluated with the desired SPL above. |
| Dynamic Range | Additionally requested headroom. This parameter is only evaluated for "Power incl. Dyn.", Vrms, and Vpeak. Note: This additional dynamic range is not factored into the basic SPL results! Please check Max SPL to ensure your speaker has sufficient reserves. |
| Boundary |
The boundary loading checkboxes use more realistic values of 4-5dB instead of theoretical 6dB. Boundary gain is only evaluated if the speaker type is set to "Subwoofer". |
Calculated Values |
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| SPL | Sound pressure level at 1m distance and at the requested listening distance. |
| MAX SPL | Maximum possible sound pressure level at 1m and at the listening distance within the nominal RMS power handling. |
| Headroom | dB reserves remaining at the listening position. Can be utilized as dynamic capability. |
| Power | The required amplifier RMS power to achieve the desired sound pressure level at the listening distance. |
| Impedance | The total impedance present at the amplifier terminals for the corresponding RMS power calculation. |
| Power with Dyn. |
The required amplifier RMS power needed to cover the additional dynamic headroom requested. |
| Volt | The required RMS and peak output voltage from the amplifier. |
| Crest | The selected crest factor used to determine the peak voltage. 3dB represents a pure sine wave, 6dB matches typical AES power ratings, and 12dB is commonly used for amplifier burst power headroom. |
| dB from Boundary |
The acoustic level gain provided by boundary room loading and placement. |
| Array Boundary | Up to this distance (in meters), the sound waves propagate as a highly efficient cylindrical wave, dropping by only -3dB per doubling of distance. Past this transition point, the sound drops off at the standard -6dB rate of a regular point source. The Boundary f/3 field indicates where this nearfield extension collapses at one-third of the input frequency. |
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