13 November 2018

Acoustical data graphs

We provided acoustical data sheets for a wide range of speakers, but what do they tell you?

We’ll start with the polars, they provide a clear overview of the loudspeakers beam,  further away from the center means that the sound level is higher at that angle. Imagine the speaker standing in the center of the circle, the circle around it indicates the sound level at this angle.

The sensitivity tells you about the overall performance of the speaker. Human hearing ranges from 20Hz to 20000Hz, the sensitivity graph shows the frequencies the speaker can handle, between 10 and 100Hz you can see the speakers bass roll-off, the further the flat part of the graph extends, the more low end the speaker will produce. Typically the curve will be flat from 200 until 2000 Hz, higher frequencies may look a bit jaggy, this is quite typical and will not be audible. This information is especially usefull for matching a speaker and a subwoofer.

The beamwidth tells you at which angle the off-axis sound level is -3dB compared to the on axis level, giving you an idea about the clear listening angle. This indicates the angle of the beam, higher frequencies will have a more narrow beam than lower frequencies.

The directivity index is a term used to describe the speakers directivity in relation to the frequency. When listening off-axis the frequency response will change, lower frequencies (<100Hz) are omnidirectional on the graph these are at 0dB. Higher frequencies (>2000Hz) will start to be directional and depending on the loudspeaker may be more or less audible at certain angles.

This allows you even better to find the most suitable one for your typical application. Find out more about the new acoustical data graphs under "downloads" at your preferred loudspeaker.

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