Here's the Impulse Response for the five B2031P studio monitors that I've measured. The graph shows how fast the output of the loudspeaker decays. Many factors effect this including resonance in the cone/surround and enclosure. A compact Impulse Response is then desired. You will also see at roughly 4 msecs the floor reflection. Notice the first graphs first reflection point is earlier than the others. It was measured under slightly different conditions. This notch, the first reflection, can aid you setting the gate on your time window when measuring a loudspeaker. You generally want to remove the first reflection from your measurement so it doesn't pollute your measured frequency response. The earlier your first reflection, the less resolution you'll be able to achieve.
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