How To Make a High Pass Filter Speaker Crossover

How To Create A High Pass Speaker Crossover.

A High Pass Filter (also known as a high pass crossover) allows the High frequency to pass by, but blocks (or lessens) the lower frequency. Generally used to block bass from speakers that can not reproduce bass. Low frequency signals can easily destroy a tweeter, so a high pass filter is very important.

A Low Pass Filter is the opposite, allows bass to pass but stops the speaker from receiving higher frequencies that it can't reliably reproduce.

Keep in mind, that this video is about simple first order crossovers. A second or third order crossover is more effective (and costly).

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Website mentioned in the video:
http://www.learningaboutelectronics.c...

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In this example:
Speaker = 8 Ohm, 1k -20k Hz frequency response
Non-Polar (aka Bipolar) capacitor used = 7.5 uF
Resulting Cuttoff Frequency = 2.65kHz

7.5uF cap is what I recommend for a speaker with a frequency response of:
1.06 kHz - 6.63 kHz and up (8-Ohm)

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Some example high pass filters for different frequency response ranges are listed below. The values are not the crossover point.

The achieved capacitor value is listed, then my "recommended for speakers with a frequency response of around" value.

For the first one below, remember that it takes two (2) regular polarized capacitors of 10uF to make one non-polarized cap with a resulting value of 5uF.

5 uF Cap =
3.18 kHz - 19.90 kHz and up (4-Ohm)
1.59 kHz - 9.95 kHz and up (8-Ohm)

7.5 uF Cap =
2.12 kHz - 13.26 kHz and up (4-Ohm)
1.06 kHz - 6.63 kHz and up (8-Ohm)

13 uF Cap =
1.17 kHz - 7.37 kHz and up (4-Ohm)
590 Hz - 3.68 kHz and up (8-Ohm)

19 uF Cap =
816 Hz - 5.10 kHz and up (4-Ohm)
408 Hz - 2.55 kHz and up (8-Ohm)

23 uF Cap =
677 Hz - 4.23 kHz and up (4-Ohm)
338 Hz - 2.11 kHz and up (8-Ohm)

28 uF Cap =
568 Hz - 3.55 kHz and up (4-Ohm)
284 Hz - 1.77 kHz and up (8-Ohm)

41 uF Cap =
388 Hz - 2.42 kHz and up (4-Ohm)
194 Hz - 1.21 kHz and up (8-Ohm)

50 uF Cap =
318 Hz - 1.99 kHz and up (4-Ohm)
159 Hz - 995Hz and up (8-Ohm)

60 uF Cap =
265 Hz - 1.65 kHz and up (4-Ohm)
132 Hz - 827Hz and up (8-Ohm)

110 uF Cap =
144 Hz - 902Hz and up (4-Ohm)
72 Hz - 450Hz and up (8-Ohm)

165 uF Cap =
96 Hz - 602Hz and up (4-Ohm)
48 Hz - 300Hz and up (8-Ohm)

235 uF Cap =
68 Hz - 422Hz and up (4-Ohm)
34 Hz - 210Hz and up (8-Ohm)

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In case I was not that clear in the video, when you combine two capacitors together, the long leg gets joined to the long leg of the other capacitor. Or the short leg gets combined to the short leg of the other capacitor. Never combine the long leg (+) to the other capacitors short leg (-).

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More Info at the 3 minute 53 second mark:
   • EEVblog #33 1of2 - Capacitor Tutorial...  

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Here's a list of the more common polarized capacitors you can buy, for making your own custom first order high pass crossovers:
https://drive.google.com/file/d/1igUB...

Or, if you're on a mobile device, this document saved as an images will likely be formatted better:
https://drive.google.com/file/d/1huFc...