Inline Xovers - Any1 got a circuit diagram

[Unregistered]

I was wondering if any1 had an idea of how to create an inline crossover then runs inline with your RCA cable connected to your amp. Im trying to create a high pass for over 100hz.
I have made a low xover 1 before but through trial and error. All it involves are 2 resistors and 2 capacitors. Im trying to find someone who possibly as the exact resistor values and capacitor values to create a high pass 100hz xover.
Any clues ?
Crutchfield makes a similar thing.
http://www.crutchfield.com/cgi-bin/S...00&I=069900062

[IASCA pro 301-6]

You're better off using something that you can buy...your RCA has very low signal strength, with semi-high impedence. The Harrison stuff seems okay, don't start hackin' your RCA's up...