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Speaker Crossover Chart and Calculator (High-pass)

Speaker Crossover Chart and Calculator (High-pass)
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This speaker crossover calculator will help you design a speaker circuit that can produce amazing audio. It will tell you what capacitors and speakers you need to produce a certain crossover frequency and the other way around.

This crossover calculator can be used to:

  1. Calculate the crossover frequency of a certain circuit using a certain capacitance and with a speaker having a certain impedance. 
  2. Calculate the required cap[iacitance to achieve a certain crossover frequency considering a speaker of a certain impedance. 

Explanation of Terms

  • C – is the capacitance value (in Farads). Please note that this is not the uF value seen on some capacitors. 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. In other words, the resistance of the speaker.
  • F – is the crossover frequency you will get.

Speaker Capacitance By Crossover Frequency

Speaker Capacitance By Crossover 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

Speaker Crossover Frequency By Capacitance

Speaker Crossover Frequency By Capacitance
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

Calculate for any Value

To use this calculator, enter the amount of capacitance you have available in the first box. Then enter the impedance of the speaker you will be using with this filter in the second box.

Finally, click the “Calculate It” button to see the frequency this filter will be -3 dB.

Capacitor =  uF
Rh = Ohms

Answer =  Hertz

  

Capacitors in Series/Parallel

To use this calculator, enter the amount of capacitance in the first two boxes, they can be different values – this is how you obtain the odd values in the charts above.

Then pick a series or a parallel connection. Now, click the “Capacitance” button to see the final resulting value.

Capacitor 1 =  uF
Capacitor 2 =  uF
Connection
ParallelSeries

  
Answer =  uF