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dBA weighting filter frequency to dBA and dBC dB(A) and dB(C) A weighted sound calculate DIN IEC 651 calculator equal-loudness contours - sengpielaudio Sengpiel Berlin
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Bandwidth calculating -3 dB cutoff frequencies -3 dB corner frequency - quality factor Q factor band pass filter center frequencyq factor formula 3 dB bandwidth in octaves vibration frequency EQ equalizer bandpass
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