Measuring the acoustic response will enable you to properly adjust the equalizer settings on your sound system for optimum performance. A typical procedure is described below:

Mode: Real-Time

Views: Spectrum, Time Series

Amplitude axis: Logarithmic

Frequency axis: 1/3 Octave

Standard Weighting: Flat

Mic compensation: Yes, if your mic is not sufficiently "flat"

Sampling rate: 44100Hz

FFT size: 8192 or 16384.

Decimation: 1

Averaging size: infinite

Smoothing Window: Uniform

Sampling Format: 16 bit, Mono

An acoustically "flat" room will produce a perfectly flat spectrum. In this instance, we are not concerned so much with the absolute values of the spectrum as with their relative response. Each 1/3 octave band corresponds to a slider on your 1/3 octave equalizer. Simply adjust the sliders on your equalizer to compensate for the acoustic response of the room. You may wish to run a second test to verify the results.

One limitation of 1/3 octave analysis is that each band represents a rather wide span of frequencies. If narrowband frequency components are present, 1/3 octave analysis lacks sufficient resolution to detect these components. Set the frequency axis scaling to linear and substitute white noise instead of pink and repeat the measurement above (you may wish to use a smaller FFT size such as 1024)