Allan:

I use a Gateway 450XL laptop and it's line-in jack. I use the line-in calibration function, but the response already pretty flat. The mic is flat to something like 100Khz.

Since you know the author, could you bring up the possibility of having a "Calculator" function where you could subtrack one graph from another and do other comparisons? The "Mac RTA" I use on the Macintosh has this function but only goes down to 20Hz.

[This message has been edited by soundhound (edited August 22, 2003).]