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Lets say you want your cutoff freq to be 200 hz, since a cap is only a first order filter(6db per octave),Any freq at 100hz will be 6db quieter than at 200hz, and at 50hz will be 12db quieter than at 200hz.So as you can see you can still ruin your speakers pretty quick.The formula for first order high pass is...
Capacitor in microfarads = 1,000,000 / (6.283 x impedance in Ohms x cutoff in hz)
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-Nulli Secundus-
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