Planar Speaker Asylum

If you are talking about small localised diaphragm resonances...

84.28.82.190

In Reply to: RE: How Are Oscillations In MMGs Measured? posted by JimOfOakCreek on August 07, 2008 at 20:52:56

I suppose you are refering to diaphragm resonances when you speak of oscillations?

The low order (low frequency) resonance modes are easy to spot in a "classical" frequency response measurement.

The smaller resonances can be seen in a Cumulative Spectral Decay (CSD) plot (or you can find them by scanning the frequency band with energy decay plots). But it would be hard to prove that the origin is a diaphragm resonance and not a suspension/frame resonance etc.

I suppose it would be ideal to measure them with a laser interferometer scanning the surface. You could passivly drive the diaphragm (with an alternate sound source) and scan for resonances.

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