In an active system the crossover points often change. Can the protection cap be chosen independent of the crossover frequency to allow for maximum flexibility and at the same time protect the driver and be sonically negligible?
Ie, is there a minimum frequency for every driver which can be chosen to yield maximum flexibility, minimum interference with the XO point and offer good protection?
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For example, I'm using 2446 and 2404.
1) Per JBL minimum recommended XO is 12dB/oct @ 500 Hz for 2446. A protection cap is only a 1st order high pass filter, hence 6dB/oct. At which frequency can this be placed to minimize risk of damage and at the same time minimize the audible effects of the lowest potential XO?
An octave below XO would be at 250 Hz, but is a 6dB/oct HPF sufficient protection against an amp blowing up, user errors in setting crossovers etc?
2) Same for 2404, which is 12dB/Oct @ 3kHz minimum per JBL. What would be the minimum frequency at which to set the cap to offer good protection and be sonically negligible?
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Yes, I know this information has been discussed a million times over, but I've yet to see a clear answer to this question. People often say "put the protection cap an octave below the crossover frequency", but in an active system the crossover point tend to move around a lot.