My Next Project: DIY Audio Measurement

I've been always interested in trying out room correction devices.  I've only read amazing things.  So I've been on the lookout of a used cheaper room correction device, e.g., TACT, but they're still too expensive.  Here's the beginnings of a DIY solution, but still not quite the solution I"m looking for.  Nevertheless its worth trying.

Picture from Sound and Vision magazine

http://www.soundandvisionmag.com/audio/2011/02/how-diy-audio-measurement