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The lines on a plot (map) showing continuous level. In a speaker plot, it shows the pattern where the sound is a given level lower than the direct center (on-axis) at a given frequency. For microphones, the isobars on the plot show the relative sensitivity at different angles off axis (based on frequency). Usually isobars are given in increments of 3 or 10dB.

Source: Church Audio & Acoustics Glossary

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