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Old 19th March 2009, 02:49 PM   #1
mjg100 is offline mjg100  United States
diyAudio Member
Join Date: Mar 2009
Default Building a simple high pass filter

I am not sure if this is the right place to ask this. If it is not the right place please let me know where to post. I have built some mid bass modules that I want to use for the 40 to 150hz range. I would like to build a high pass filter at 40hz. From what I have read I need to install a capacitor in series on the + wire before the amplifier and install a 33k resistor in parallel right after the capacitor. The equation to figure the capacitor is; C=1/(2)(pi)(R)(F). Where:
C=capacitor size
F=high pass wanted

For 40hz high pass I get C=0.048uF. Is this correct? Am I also correct on the installation procedure? If not could some one explain how I calculate the correct value and install it.
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Old 19th March 2009, 03:30 PM   #2
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Join Date: Dec 2007
What ohm load?
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Old 19th March 2009, 03:38 PM   #3
mjg100 is offline mjg100  United States
diyAudio Member
Join Date: Mar 2009
Originally posted by aznboi3644
What ohm load?

Home theater application using 4 ohm driver. I looked at your link and I thought that when a capacitor is placed in series after the amplifier the high pass is not very consistent. In other words the crossover point varies as the speaker impedance changes?
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