im planning on adding super tweeters to my sansui full range speakers. what value of capacitance is required for a 2nd order hpf @10khz if i already have the inductor which are 0.30mH? Or is it even possible? i know there are calculators online but i want to use what i already have if possible. thanks in advance
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What (actual, not nominal) driver impedance have you got, and what filter Q are you aiming for?
If you're not fixed on the latter and you want to use your 0.3mH coils, then for a 8ohm nominal (which it's exceedingly unlikely to be in practice) roughly a 0.82uF cap with that inductor in shunt will give you a 2nd order on approximately a 0.43 filter Q. Ideally it's a 0.86uF, but 0.82 is 'near enough' given that the driver is almost certainly not 8ohms. Same values for nominal 4ohm with all the aforementioned caveats, but the filter Q drops to a very low 0.21 or thereabouts, so not ideal.
If you're not fixed on the latter and you want to use your 0.3mH coils, then for a 8ohm nominal (which it's exceedingly unlikely to be in practice) roughly a 0.82uF cap with that inductor in shunt will give you a 2nd order on approximately a 0.43 filter Q. Ideally it's a 0.86uF, but 0.82 is 'near enough' given that the driver is almost certainly not 8ohms. Same values for nominal 4ohm with all the aforementioned caveats, but the filter Q drops to a very low 0.21 or thereabouts, so not ideal.