You could probably rig up something with cool edit pro. In fact, I'm quite
sure of it. The demo version is free and functional. Also, I had this page
bookmarked for some reason:

http://www.trueaudio.com/rta_down.htm

But you'll have to calibrate the mic and all.

Also, you may want to try this site for info:

http://www.linkwitzlab.com/links.htm

But crossover points should not be set up using RTA anyway.

Hi there... Does anyone make an RTA Program? Something I can run my my
IBM T20 Laptop?
I know it will not come close to the $2000+ units I see.

Im looking for a basic RTA I can use to set up crossover points and
such. possibly a program I can run on my laptop with a calibrated mic?

Does something exist for the casual hobbyist? possibly $30 for the
software and $60-$100 for the mic.