Certes KLEAR AUDIO KLR1m, User Manual

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Any sharp and deep dip means some problems in your loudspeaker (something out of
phase) or problems in particular measurement. Evaluate how close is the light blue
curve to the PFR green curve of your measurement. The blue curve represents noise
and interference from one measurement sweep to next one because of reverberation. It
must be at least 10
– 15 dB below PFR curve. Ordinary it is not visible.
Evaluate IR curve of your measurement. It must look like this:
You must not see “spikes” in region from 250ms to the end of graph like those.
If you see such spikes, it means you have large nonlinear distortions in your
loudspeaker. You must be especially careful if such spikes are different for your
system’s each of two channels.