TrueRTA spectrum analysis software is about the best option you can get. I use it with my Gateway laptop computer and it gives excellent 1/24th octave resolution. Go for the full version that costs a reasonable $99.
www.trueaudio.com Behringer makes an excellent measurement microphone:
http://www.musiciansfriend.com/srs7/sid=...ase_pid/270400/ You will need a preamp that supplies 48 volt phantom power to power the microphone. Musicians Friend also carries several of these, made by M-Audio and others. The M-Audio preamps feature USB connections that can go right into your computer:
http://www.musiciansfriend.com/srs7/sid=...ase_pid/701368/ This setup will give you very close to full professional RTA analysis capability. The TureRTA software generates the necessary pink noise and discrete test tones, and it also has an ocilloscope feature.
[This message has been edited by soundhound (edited June 28, 2004).]
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