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![4 Measured polar response of a d&b B6 subwoofer at 40 Hz (red), 63 Hz... | Download Scientific Diagram 4 Measured polar response of a d&b B6 subwoofer at 40 Hz (red), 63 Hz... | Download Scientific Diagram](https://www.researchgate.net/publication/323914297/figure/fig3/AS:606601169870849@1521636397259/Measured-polar-response-of-a-d-b-B6-subwoofer-at-40-Hz-red-63-Hz-yellow-80-Hz.png)