Dayton Audio OmniMic V2 Precision Measurement System User Manual
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At the bottom is a check box labeled "adjust for response". This affects whether the
variations in relative bass strength are included when calculating the the decay graph.
when the "adjust for response" box is unchecked, the bass decay shown does not take the
frequency response into accout. All decibel levels are with respect to whatever the response
level is at each frequency. At frequencies where there is lower overall output (as shown on the
upper graph), the decay may appear to be longer than actual because of background noise in
the room that is inseparable from the low bass levels.
when the box is checked, the decibel levels are with respect to the blue line shown on the
frequency response graph. For instance, if the line is at 70dB SPL, then the white area of the
Bass Decay graph shows how long it takes before the level dropped below 65dBSPL (that is,
70dBSPL minus 5dB), the light blue shows how long before the level dropped to 60dBSPL,
etc.