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To calculate the resistor value for a frequency not on the chart use the following:
3386
f
o
= R (in kΩ) for .047µf cap
= R (in kΩ) for .022µf cap
7234
f
o
Where: R = Ω
f
o
= desired crossover frequency
c = capacitor in farads
ex: .047 x 10
-6
for .047mf cap
The actual formula is: R =
1
2πf
o
c
Butterworth Alignment Q = .707
1% resistors used with 0.047µF capacitors
Butterworth Alignment Q = .707
1% resistors used with 0.022µF capacitors
Frequency R1 R2
20Hz 357kΩ 357kΩ
25Hz 287kΩ 287kΩ
30Hz 237kΩ 237kΩ
35Hz 205kΩ 205kΩ
40Hz 178kΩ 178kΩ
45Hz 162kΩ 162kΩ
50Hz 143kΩ 143kΩ
55Hz 130kΩ 130kΩ
60Hz 121kΩ 121kΩ
65Hz 110kΩ 110kΩ
70Hz 102kΩ 102kΩ
75Hz 95.3kΩ 95.3kΩ
80Hz 90.9kΩ 90.9kΩ
85Hz 84.5kΩ 84.5kΩ
90Hz 80.6kΩ 80.6kΩ
200Hz 35.7kΩ 35.7kΩ
300Hz 23.7kΩ 23.7kΩ
400Hz 17.8kΩ 17.8kΩ
500Hz 14.3kΩ 14.3kΩ
600Hz 12.1kΩ 12.1kΩ
700Hz 10.2kΩ 10.2kΩ
800Hz 9.9kΩ 9.9kΩ
900Hz 8.6kΩ 8.6kΩ
1kHz 7.15kΩ 7.15kΩ
1.2kHz 6.04kΩ 6.04kΩ
2.0kHz 3.57kΩ 3.57kΩ
3.0kHz 2.37kΩ 2.37kΩ
4.0kHz 1.76kΩ 1.76kΩ
5.0kHz 1.43kΩ 1.43kΩ
6.0kHz 1.21kΩ 1.21kΩ
7.0kHz 1.02kΩ 1.02kΩ
8.0kHz 909Ω 909Ω
– 18 –
Frequency R1 R2
20Hz 169kΩ 169kΩ
25Hz 133kΩ 133kΩ
30Hz 110kΩ 110kΩ
35Hz 95.3kΩ 95.3Ω
40Hz 84.5kΩ 84.5kΩ
45Hz 75kΩ 75kΩ
50Hz 68.1kΩ 68.1kΩ
55Hz 61.9kΩ 61.9kΩ
60Hz 56.2kΩ 56.2kΩ
65Hz 52.3kΩ 52.3kΩ
70Hz 48.7kΩ 48.7kΩ
75Hz 45.3kΩ 45.3kΩ
80Hz 42.2kΩ 42.2kΩ
84Hz 40.2kΩ 40.2kΩ
90Hz 37.4kΩ 37.4kΩ
200Hz 16.9kΩ 16.9kΩ
300Hz 11.3kΩ 11.3kΩ
400Hz 8.45kΩ 8.45kΩ
500Hz 6.65kΩ 6.65kΩ
600Hz 5.62kΩ 5.62kΩ
700Hz 4.75kΩ 4.75kΩ
800Hz 4.22kΩ 4.22kΩ
900Hz 3.74kΩ 3.74kΩ
1kHz 3.40kΩ 3.40kΩ
1.2kHz 2.8kΩ 2.8kΩ
2kHz 1.69kΩ 1.69kΩ
3kHz 1.10kΩ 1.10kΩ
4kHz 845Ω 845Ω
5kHz 665Ω 665Ω
6kHz 562Ω 562Ω
7kHz 487Ω 487Ω
8kHz 422Ω 422Ω
RESISTOR CHART
The following charts list the resistor values to use for common crossover frequencies.