Values for a low pass filter

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Winnie

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Joined 2003
I have recently been reading up a bit about low pass filters, but am struggling to calculate values.
I intend to build the low pass filter shown here:

http://www.t-linespeakers.org/tech/...assiveHLxo.html

It will be installed between the speaker posts of a valve amplifier (that will continue to drive the main speakers) and the inputs to a transister amp that will drive the subs.

I need a second order filter (12db) and a corner frequency of 75Hz. This, I think, will require just 2 resistors and 2 capacitors per channel - but what values?
Can you help, and if possible show me how the calculation is done so I can help myself in the future.

Thanks
:confused:
 
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