"... after I did my RTA adjustments ..."

What are some of the cheapest ways to RTA a system? Renting an audio analyzer is mucho $$$ (~150 per day from a cursory search) which would limit me to one day. Any software based solutions that aren't very expensive would be nice.

Cory
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MK2a 160GB

11 Years later, these Mk2a units still rock...