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Cone treatment to widen highs of fullrange driver?
Cone treatment to widen highs of fullrange driver?
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Old 29th January 2019, 02:00 PM   #21
Joseph Crowe is offline Joseph Crowe  Canada
diyAudio Member
 
Join Date: Mar 2012
Location: Picton Ontario
I've been able to successfully widen the dispersion by implementing a circular baffle of special design. I also noticed improved time domain acoustical measurements which I think contributed the most to the subjective improvement to the sound. After adding the circular baffles to my floorstanding speakers I had to apply a more aggressive baffle step filter. I believe this was due to the increased high frequency output from the averaged response within the 0 to 30 degree off-axis listening window...even though the on-axis frequency response changed very little.


I also saw subtle improvement in the spectrogram burst decay results in the region between 4kHz - 20kHz (see pictures)


I wasn't expecting this but the impulse response improved from 1.3ms to 0.8ms as well.


The curved front face is a exponential spiral curve which I've had very good results using in some of my front horns. So my rationale was to utilize this same curve equation in a circular baffle, which is what you see.
Attached Images
File Type: jpg Circular Baffle.jpg (237.0 KB, 46 views)
File Type: jpg burst square.jpg (260.2 KB, 46 views)
File Type: jpg burst circle.jpg (234.2 KB, 38 views)
File Type: jpg IR Square.jpg (155.2 KB, 41 views)
File Type: jpg IR Circle.jpg (156.1 KB, 43 views)
File Type: jpg section.jpg (262.8 KB, 28 views)
File Type: jpg front view.jpg (253.1 KB, 26 views)
File Type: jpg rear view.jpg (297.2 KB, 23 views)
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