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Old 13th May 2013, 08:26 AM   #141
solhaga is offline solhaga  Sweden
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Quote:
Originally Posted by RayCtech View Post
Then the depth of the wave guide should match the 15" - depth from front of driver (15") to where the voice coil / dust cap are mounted. My 15" cones are 100 mm deep....
But shouldn´t the wave guide depth start at where the AMT´s area is equal to the 15"´s area and not at the dust cap?
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Old 13th May 2013, 10:26 AM   #142
solhaga is offline solhaga  Sweden
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I mean that the throat/cone of the wave guide in this case is 120x160 mm and not the area of the 15" voice coil.
The opening is still 380x380 mm though.
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Old 14th May 2013, 03:39 AM   #143
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Quote:
Originally Posted by RayCtech View Post
If you use a waveguide instead of EQ you will improve the fidelity as the distortion will be much lower. And the directivity and soundstage improves also...
Picture shows the first prototype with AMT "midrange" and AMT "super tweeter" in a CNCed Corian waveguide, and three 8" drivers in a combined CNCed Corian baffle / basket..

Click the image to open in full size.
hi Raymond

your prototype amt speakers looks amazing. How does it perform ? where do you cross the amt to the cone woofers ? Will you develope a bass amt later on ?

Angelo
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Old 14th May 2013, 05:56 AM   #144
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Originally Posted by solhaga View Post
But shouldn´t the wave guide depth start at where the AMT´s area is equal to the 15"´s area and not at the dust cap?
For a starter 50 mm should be easy for you to implement.
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Old 14th May 2013, 06:15 AM   #145
solhaga is offline solhaga  Sweden
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Yes, but I need to vertically align the AMT to the woofer before I can do any listening tests. Now the woofers are 30 cm apart from the AMT.
But, for sure, I can do some directivety and SQ measurements first.
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Old 14th May 2013, 06:41 AM   #146
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Originally Posted by angeloitacare View Post
hi Raymond

your prototype amt speakers looks amazing. How does it perform ? where do you cross the amt to the cone woofers ? Will you develope a bass amt later on ?

Angelo
300 or 500Hz (6dB/oct series filter). Bass AMT diaphragms and parts was developed and made more than three years ago - but never assembled.. Since then a lot of new products / technologies have been researched, developed and prototypes made.. Production, marketing and sales are not my "cup of tea" and time and cash then only allows for prototypes and pre-production items for my own use...
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Old 15th May 2013, 03:34 AM   #147
solhaga is offline solhaga  Sweden
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Frequency plots at 1 m. 0, 15 and 30 degrees.

This membrane with 7 um doesn´t go quite as low as the 10 um membrane.


Click the image to open in full size.

Does anyone know how to make Holm show more than three curves?
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Old 15th May 2013, 08:20 AM   #148
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Originally Posted by solhaga View Post
Frequency plots at 1 m. 0, 15 and 30 degrees.

This membrane with 7 um doesn´t go quite as low as the 10 um membrane.
With wave guide this will change slightly and I expect a 5 to 10 degree placement (with wave guide) will give very good results..
Filtered at 200 - 250Hz and you will have -3dB at 350 - 400Hz...

Last edited by RayCtech; 15th May 2013 at 08:23 AM.
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Old 15th May 2013, 10:38 AM   #149
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Quote:
Originally Posted by RayCtech View Post
300 or 500Hz (6dB/oct series filter). Bass AMT diaphragms and parts was developed and made more than three years ago - but never assembled.. Since then a lot of new products / technologies have been researched, developed and prototypes made.. Production, marketing and sales are not my "cup of tea" and time and cash then only allows for prototypes and pre-production items for my own use...
hi Raymond

are your plans to make progress with the bass amt this year ? A fullrange amt speaker will be a major evolution, if not revolution, in high-end audio......
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Old 15th May 2013, 11:56 AM   #150
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Originally Posted by angeloitacare View Post
hi Raymond

are your plans to make progress with the bass amt this year ? A fullrange amt speaker will be a major evolution, if not revolution, in high-end audio......
Plans = yes, time and cash = ?
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