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Your task, should you choose to accept it:

• Review Impulse Response: http://en.wikipedia.org/wiki/Impulse_response
• Get an idea how measuring the impulse response of a speaker system can be used for understanding reflections and their impact on what you hear: http://www.duffroomcorrection.com/wiki/Impulse_Response
• This now leads naturally into Time-Frequency analysis, and some pretty graphs to stare at. http://drc-fir.sourceforge.net/doc/drc.html#htoc233 The graphs are shown in pairs - uncorrected / corrected. The impulse response is used to generate the corrected portion of the graph. The differences in amplitude across frequencies at time = 0 should be pretty obvious.

I actually have a set of these measurements in a 30 page PDF generated from measurements I took of my car stereo. OK I’m a nerd…