Sound power selection guide

Basics of the sound level

The colloquial sound level in relation to loudspeakers means the sound pressure level (SPL) as a sound field quantity.

The sound pressure level is expressed in the logarithmic unit decibel (dB). Therefore, doubling the sound pressure means increasing the sound pressure level by 6 dB. In contrast, a doubling of the volume perceived by humans means an increase in the volume level by 10 dB.

Therefore, doubling the loudspeakers also means an increase of 6dB.*

When the distance from the loudspeaker is doubled, the sound pressure level decreases by 6 dB.**

At long distances, there is an additional frequency-dependent air damping (dissipation), which means that high frequencies are damped more at greater distances.

Our engineers will be happy to advise you on the right choice of systems for your application.


This questionnaire should be completed using the white papers associated with each product.

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Measurement methods for sound level data on the website

SPL max:

Effective sound pressure level of an 85 ms sine burst in the loudest 1/12 octave band,
at a maximum of 20 % THD.


Peak sound pressure level of the highest occurring peak during white noise reproduction.

* With coherent coupling of the sources and equal amplifier power per speaker.

** Reciprocal distance law 1/r, In the far field of a loudspeaker