Dayton Audio OmniMic V2 Precision Measurement System - Manual (Page 14)

14 | P a g e
"
Toneburst Energy Storage " shows the effect that would occur if the loudspeaker were driven by short tonebursts
of energy one at at time, concentrated near each test frequency. The speaker output would ideally end after the toneburst
ended, but realworld devices will continue to ring as the energy stored within dies out. This is similar to a test devised by
Linkwitz. The Toneburst Energy Storage data in OmniMic is calculated from a measured impulse response, and the
number of applied toneburst cycles can be selected using a control at the bottom right. Like the CSD waterfall, the
impulse response can be windowed to remove effects of reflections.
The grey area shows the energy that is expected if there were no storage or hangover. The light-blue area forward of
that is the stored (delayed) energy at the indicated frequency.
The CSD and Toneburst Energy Storage waterfall plots are useful identifying moderate to high Q resonances in a
drivers's frequency response. The audibility of the features easily identified in these waterfall plots is somewhat
controversial, with some research (see Toole) indicating that the higher Q resonances seen in waterfall displays are
significantly less audible than low-Q resonances that do not stand out in CSD or TES waterfall displays. In any event, it
should be remembered that waterfall data (and also frequency response data) are simply alternate presentations of
information contained within impulse responses.