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Documentation for Sub-Woofer Crossover |
Frequency/Phase Response
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The waveforms above are typical of the smooth sine waves
I found at the output of both filters, except for the
anomaly around 60Hz in the high-pass output.
Although the amplitude is 15-20db down, it is audible.
This may take some time and probing to resolve.
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Monaural Sub-Woofer Crossover: Center Frequency: 150Hz ; Slope: 18db/octave
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20Hz Low-Pass
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40Hz Low-Pass
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50Hz Low-Pass
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60Hz High-Pass (ouch!)
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70Hz High-Pass
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20Hz
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60Hz
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80Hz
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200Hz
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400Hz
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600Hz
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800Hz
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Phase relationships of the filters can be determined by connecting the high-pass output of the crossover to the vertical input of an oscilloscope and connecting the low-pass output to the horizontal input of the scope, generating the X-Y patterns above. Note that the
glitch at 60Hz is readily visible.
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