It occured to me that, in theory at least, a passive line level low pass filter could be made with a pot to create a variable filter that would be useful for experimenting.
The filter is a resister in series with the amp and a parallel cap.
The recommended resistor value is between 5k and 10k and the cap is calculated with the following formula:
c = 1/2pi(Resistor)(Frequency)
Heres the site I got the info from:
I have a few questions though.
Is it important that the resistor be within the range of 5k to 10k as recommended.
My idea was to use a 1K resistor in series with a 10k pot (the 1K resistor is just to keep the filter from going into wierd frequency ranges) so that I could vary the filter from about 50hz to a couple hundred or so (Dont remember the exact frequencies as calculated but you get the idea).
Is there anything Im overlooking here other then the insertion loss that will cause this to go ary.
Also, the site I was reading about this on suggests using pots to balance the filters, but a pot in series with the low pass will change the frequency of the filter and after would change the frequency of the high pass, assuming its used. Where should it be inserted. Im also assuming a passive pre is not an option with these. Am I correct.
The filter is a resister in series with the amp and a parallel cap.
The recommended resistor value is between 5k and 10k and the cap is calculated with the following formula:
c = 1/2pi(Resistor)(Frequency)
Heres the site I got the info from:
I have a few questions though.
Is it important that the resistor be within the range of 5k to 10k as recommended.
My idea was to use a 1K resistor in series with a 10k pot (the 1K resistor is just to keep the filter from going into wierd frequency ranges) so that I could vary the filter from about 50hz to a couple hundred or so (Dont remember the exact frequencies as calculated but you get the idea).
Is there anything Im overlooking here other then the insertion loss that will cause this to go ary.
Also, the site I was reading about this on suggests using pots to balance the filters, but a pot in series with the low pass will change the frequency of the filter and after would change the frequency of the high pass, assuming its used. Where should it be inserted. Im also assuming a passive pre is not an option with these. Am I correct.
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