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In Reply to: RE: Adding a tweeter to MMG posted by aceinc on February 26, 2017 at 19:30:16
There is no way for damping to make a significant dent in the cavity resonance. It is formed by the physical spacing between the diaphragm and the magnet board. But it has one saving grace in that it does not have a syncronized on axis component. It is entirely random noise on axis so it cancels out as you increase the number of drivers. It is nearly gone at 6 drivers per side and entirely gone at 8 drivers per side. Waveguides can also be used to get cancellation of the cavity resonance peak with fewer drivers. Measurements I saw show it disappearing with 4 driver arrays in an 8" or so waveguide or constant directivity horn.
Follow Ups:
Satie, what is the shape of the wave guide, or do you have link to further info on this?
Here is the reference. With the CD horn/waveguide, you need to apply EQ to correct for falling response due to the horn geometry of 3db/octave starting about 3khz. CD EQ is a feature of many old electronic crossovers and all digital crossovers.Report with EQ is flt to 20khz and 3db higher sensitivity which brings you to the mid 90s db.
Edits: 02/28/17
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