 |
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 |
|