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Old 29th October 2012, 11:30 AM   #1221
Tytte71 is offline Tytte71  Norway
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Looks like a nice improvement with the Aquaplas, needing less correction and better time domain performance (wonder if distortion figures improves as well). Have you done any listening comparison?
Also, how much Aquaplas did you add?
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Old 29th October 2012, 07:08 PM   #1222
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Quote:
Originally Posted by gedlee View Post
It was 6 or 6.5° (I don't remember the decimal places) - half angle.
6.5 degrees half angle would make it 13 degrees included angle as I mentioned.
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Old 29th October 2012, 10:03 PM   #1223
jzagaja is offline jzagaja  Poland
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Quote:
Originally Posted by Tytte71 View Post
Have you done any listening comparison?
Also, how much Aquaplas did you add?
Will send sample diaphragms to Autotech for evaluation. Hard to say how much Aquaplas - just to cover diaphragm completely with white coating. About 7-10 layers.
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Old 29th October 2012, 10:14 PM   #1224
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The sensitivity takes a big hit from the extra mass of the Aquaplas.

Standard application recommendation for optimum damping of diaphragm resonances is to cover the center 25%, as that is where amplitude is greatest.

If you wanted to get fancy you could effect constrained layer damping by adhering a small disk, or maybe two crossed strips for less mass, of aluminum foil to the center of the diaphragm.
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Last edited by noah katz; 29th October 2012 at 10:17 PM.
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Old 14th November 2012, 06:03 PM   #1225
jzagaja is offline jzagaja  Poland
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Applying Aquaplas using table top fan:

https://docs.google.com/open?id=0ByP...05GWmhoN2huaEE
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Old 17th November 2012, 05:48 PM   #1226
jzagaja is offline jzagaja  Poland
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First day of using Bruel Kjaer 2012 Audio Analyzer - setting up Mummy crossover (12BR70+D800Ti). I would like to contact anyone familiar with this nice machine.
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Old 18th November 2012, 02:35 PM   #1227
jzagaja is offline jzagaja  Poland
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Intermodulation distortion with and without Aquaplas.
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File Type: png Aquaplas_2.png (611.1 KB, 369 views)
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Old 18th November 2012, 05:32 PM   #1228
jzagaja is offline jzagaja  Poland
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Interesting isn't it? Both ends are nicely lowered but waveguide modes region is not. I need to change base frequency and check again - maybe I hit a HOM
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Last edited by jzagaja; 18th November 2012 at 06:01 PM.
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Old 19th November 2012, 07:15 PM   #1229
jzagaja is offline jzagaja  Poland
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D800Ti when equalized (2 notches) has dip at 2.6kHz - Aquaplas may help.
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File Type: png Mummy_4_crossover_sim.png (26.1 KB, 278 views)
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Old 19th November 2012, 08:08 PM   #1230
jzagaja is offline jzagaja  Poland
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Problem with stiff suspension drivers like D800Ti is crossover point below 1kHz. Higher is problematic due to driver/waveguide resonance. Don't be afraid of 12BR70 higher midrange distortion - it's not a problem as seen on below picture.
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