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High Pass Crossover Filter Schematic
Highpass Filter
To determine the crossover frequency a certain amount of capacitance will give you, use the formula:

0.159/(C x Rh) = F

Explanation of Terms
C - is the capacitance value (in Farads) - to convert to Farads divide the value shown on the side of the cap in uF by one million.
Rh - is the impedance of the load (speaker) you will be using.
F - is the crossover frequency you will get.

 

by frequency
Crossover Frequency (Hertz) Capacitance uF (microFarad)
8 Ohms 4 Ohms 2 Ohms
80 248.44 496.88 993.75
100 198.75 397.50 795.00
120 165.63 331.25 662.50
150 132.50 265.00 530.00
200 99.38 198.75 397.50
280 70.98 141.96 283.93
400 49.69 99.38 198.75
600 33.13 66.25 132.50
800 24.84 49.69 99.38
1000 19.88 39.75 79.50
1200 16.56 33.13 66.25
2000 9.94 19.88 39.75
4000 4.97 9.94 19.88
5000 3.98 7.95 15.90
6000 3.31 6.63 13.25
8000 2.48 4.97 9.94
10000 1.99 3.98 7.95
12000 1.66 3.31 6.63

 

by capacitor
Capacitance uF (microFarad) Crossover Frequency (Hertz) approximate
8 Ohms 4 Ohms 2 Ohms
2.2 9034 18068 36136
3.3 6023 12045 24091
4.7 4229 8457 16915
6.8 2923 5846 11691
10.0 1988 3975 7950
22 903 1807 3614
50 398 795 1590
100 199 398 795
200 99 199 398