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Old 26th January 2006, 03:40 PM   #1
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Default Passive Line Level High Pass

I need a temporary high pass filter or rumble filter for a subwoofer set at 40hz until i can get something active sorted out.

I had a look at: http://en.wikipedia.org/wiki/High-pass_filter Which seems to give the circuit and the equation, however i have no idea what sort of resistor value to use in order to derive the capacitance required.

Any help as to what sort of resistor value i should be looking at for a line level filter?
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Old 26th January 2006, 03:46 PM   #2
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It depends entirely on what impedance feeds the filter, and what impedance it in turn feeds. Also, a crude passive filter isn't really steep enough, get a dual-opamp and build an active filter!.
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Old 26th January 2006, 07:16 PM   #3
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More info

http://www.t-linespeakers.org/tech/f...ssiveHLxo.html

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Old 27th January 2006, 12:50 AM   #4
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I do indeed intend to build an active filter, i just want a quick and easy passive one until i have the time to do so.

How can i calculate my amplifiers input impedance and preamps output impedance?
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Old 27th January 2006, 12:56 AM   #5
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There is a thread in SS showing you how to calculate the input impedance.
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Old 27th January 2006, 08:36 AM   #6
sreten is offline sreten  United Kingdom
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Hi,

a temporary solution is to drastically reduce the
input coupling capacitor value of the sub amplifier.

As prevously stated, won't work that well.

/.sreten.
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Old 27th January 2006, 11:19 AM   #7
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Thanks for the help, however i found a digital 250 band equaliser plugin for winamp which i will be able to use when i need the high pass filter. The filter can be set for flat response at 39hz and to be 60db down by 35hz.

http://coyote.freeweb.hu/winamp/dsp.cgi

I will probably build a steep opamp filter however since it just so happens the sound source for this little event is a computer running winamp. I have tested the plugin with a spectrogram and it does work effectively at cutting out low bass.
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