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Old 5th January 2014, 02:53 PM   #421
solhaga is offline solhaga  Sweden
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It seems that the response levels out at 2-3 kHz and then there´s the usual of peaks and dips above that.
Too heavy membrane in order to get better lower frequency response?

Isn´t the distortion a little bit high?
At what distance and angle do you measure and at what power level?

What´s your analysis, Bernt?
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Old 5th January 2014, 05:03 PM   #422
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I measure at 1meter 2,8v. and app.15-20'
My magnets might be too week to control the heavier diaphragm.
Best result is with one layer of mylar,and 10my alu.
I have ordered 10x25x25mm neodyn magnets for my "kithara"magnetsystem,to test in a stronger field.

You used remount spray for your cutting.
Do you think it can be used for the cutting mat, as mine is not so sticky now.


Bernt

Last edited by båndsei; 5th January 2014 at 05:18 PM.
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Old 5th January 2014, 05:25 PM   #423
solhaga is offline solhaga  Sweden
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Quote:
I measure at 1meter 2,8v. and app.15-20'
I think you should measure as close as possible (10 cm?) and at 0 degrees when it comes to measure the distortion. This to avoid room, noise and early reflections in the measurements.

Quote:
My magnets might be too weak to control the heavier diaphragm
Perhaps you could move the magnets apart in order to prove that theory.

Quote:
Do you think it can be used for the cutting mat
Yes, that´s what the scrappers use to refurbish the mat.
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Old 16th May 2014, 10:10 AM   #424
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[IMG]Click the image to open in full size.[/IMG]
I have made some new models.
[IMG]Click the image to open in full size.[/IMG]

I have made a curved line of 4 amt´s ,did´t like it.4 amt´s in a Square, better.
And now 2 amt´s angeled 10'
[IMG]Click the image to open in full size.[/IMG]
I have not measured it ,but crossing at 500 Hz.sounds good.
[IMG]Click the image to open in full size.[/IMG]
Larger than my first model, placed on top.

Bernt

Last edited by båndsei; 16th May 2014 at 10:16 AM.
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Old 16th May 2014, 12:08 PM   #425
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Impressive collection!
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Old 16th May 2014, 04:01 PM   #426
solhaga is offline solhaga  Sweden
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Quote:
Originally Posted by båndsei
crossing at 500 Hz.sounds good.
That's great.

Sure that you got the four AMTs in phase ?
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Old 16th May 2014, 06:48 PM   #427
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Old 16th May 2014, 07:57 PM   #428
Baldin is offline Baldin  Denmark
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Old 19th May 2014, 07:21 PM   #429
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I have listened a bit more and tried different crosoverpoint's . 800 Hz might be better.
I expected the 4 amts to be better than 2. It's the same.
[IMG]Click the image to open in full size.[/IMG]
2x 170mm. AMT,s. Measured at 1m. 2,8v. on axis.
Thank you all for positive comments.

Bernt
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Old 23rd October 2014, 08:02 PM   #430
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You posted your pictures with imageshack, the thread is pretty much useless now...
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