Examination tools take a variety of forms, from the simple physical tools used to measure a speaker angle to the complex audio analyzer. Each has a role to play in the big picture. The most challenging to us is the audio analyzer, the diagnostic tool used to monitor the variance in the electronic and acoustic signals as they move through the transmission path to the listener. A key role of the analyzer is to help us understand what we hear. These tools inform the designer and optimization engineer about the extent of level, spectral and ripple variance over the space and tell us how well the original signal has been preserved.