Your question implies a passive crossover, but neglects to mention the speaker impedance much less the inductor(s) and the order of the filter or the circuit. But a passive crossover is generally a bad idea for subs because a sub is maybe 10dB less sensitive than the full range drivers, so a sub driven from a full range amp through a passive crossover is almost useless. If you want a sub, you need a 2.1 (etc) channel amp with a gain control for the sub.
Also, 20Hz is not a rational frequency for a crossover. It might be a reasonable sub-sonic filter frequency but a bit high. Generally, a sub needs to work from maybe 10Hz to 90Hz.
Also, 20Hz is not a rational frequency for a crossover. It might be a reasonable sub-sonic filter frequency but a bit high. Generally, a sub needs to work from maybe 10Hz to 90Hz.
Here is a link:
Mike Rothacher's filter application from: http://doublesecretlabs.com/apps/passxo
This is from the 6-24 article Nelson wrote.
Mike Rothacher's filter application from: http://doublesecretlabs.com/apps/passxo
This is from the 6-24 article Nelson wrote.