http://audiograveyard.info/pro-audio/what-does-the-corner-frequency-for-a-speaker-crossover-network-represent-and-how-do-you-calculate-it All About vintage pro audio Fri, 20 Jul 2012 18:26:39 +0000 hourly 1 http://wordpress.org/?v=3.3.2 http://audiograveyard.info/pro-audio/what-does-the-corner-frequency-for-a-speaker-crossover-network-represent-and-how-do-you-calculate-it#comment-110 seasnowsky Wed, 24 Dec 2008 11:46:27 +0000 http://audiograveyard.info/engineering/what-does-the-corner-frequency-for-a-speaker-crossover-network-represent-and-how-do-you-calculate-it#comment-110 On a low pass filter, the corner frequency is the frequency at which the output power drops 3dB from the dc point. This corresponds to the point where the output voltage decreases by 30% (or, more accurately, where it drops to 1/sqrt(2) of the dc value). So, if you already have measured the output voltage over frequency (with a constant amplitude input voltage), then just find the frequency at which the output voltage drops 30%. Do the same for your high pass, only this time find the point at which the voltage is 30% less than the high frequency 'flat' portion. If you designed your speaker network correctly, both the low pass and high pass would have the same crossover frequency. On a low pass filter, the corner frequency is the frequency at which the output power drops 3dB from the dc point. This corresponds to the point where the output voltage decreases by 30% (or, more accurately, where it drops to 1/sqrt(2) of the dc value). So, if you already have measured the output voltage over frequency (with a constant amplitude input voltage), then just find the frequency at which the output voltage drops 30%.
Do the same for your high pass, only this time find the point at which the voltage is 30% less than the high frequency ‘flat’ portion.
If you designed your speaker network correctly, both the low pass and high pass would have the same crossover frequency.

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