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Old 15th December 2009, 06:11 PM   #481
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OK when looking at the polar plot it seems obvious, it is the
ratio absorbed on the rear ...
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Old 16th December 2009, 12:15 AM   #482
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[QUOTE=LineArray;1996038]Hi Markus,

Those examples should illustrate, that a resonator with high Q
involved in a system is not a problem in itself necessarily.

It depends on how the whole system is designed and aligned as a
network, including all coupled compliances, mass reactances and
resistances.


Well put!!!

Jack
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Old 16th December 2009, 12:46 AM   #483
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[QUOTE=mkstat;1978181]Hi Mikadosan!
Removing/rounding the corners seems to help to improve this shift of the tangential modes, leaving the problem of lower efficiency of the tangential modes compared to the axial ones.


Rounding the corners has made a very definable difference in my experiments.

Jack
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Old 16th December 2009, 10:13 AM   #484
mkstat is offline mkstat  Austria
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Default AkAbak

Hi!

In AkAbak you can open the associated dialog (for example DMPanel, Exciter,...) by setting the cursor in the script editor in the line of the function and clicking the "Current Element" button (it's the 7th button from the left).
current element.jpg

It seems there is also the possibility to include diffraction effects to the simulation of the radiating element "DMPanel".
AkAbak dialog.jpg


I have found an investigation about PU-foam sandwich panels:
Foam Panels.pdf

regards
Markus

Last edited by mkstat; 16th December 2009 at 10:30 AM.
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Old 17th December 2009, 11:27 AM   #485
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Really interesting thread

I have about12 of these that I removed from some flat panel NXT iPod speakers last year.... do you think they will be any good for this project?
http://www.diyaudio.com/forums/attac...panel-pair.jpg

They are about 30mm diameter I think

Maybe two picture panels on the wall and a sub...... should be interesting!?
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Damn... why didn't I think of that!

Last edited by Lostcause; 17th December 2009 at 11:29 AM.
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Old 17th December 2009, 12:12 PM   #486
el`Ol is offline el`Ol  Germany
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Quote:
Originally Posted by mkstat View Post
I have found an investigation about PU-foam sandwich panels:
In the Visaton-Forum there is currently discussed whether it can be useful to stiffen/flatten end grain balsa with PU glue and a thin foil as cover.
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Old 17th December 2009, 04:12 PM   #487
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Anyone tried pushpull NXT's on either side of the same singular panel?

Or pushpush monopole, magnet backs glued together, abusing twin
opposing panels? What happens in the gap between, does this load
as a diffraction slot terminated circumferential horn (sorta like JBL
Aquarius)?

What happens if you clip two opposing corners, as one might do to
slightly broadband a patch antenna?

What if one were to line array the front and/or back of a panel
with these transducers? Not exactly down the centerline, but
in a line canted slightly offcenter, for resonant diversity...

I now own 16 transducers, and confronted by too many options.
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Old 18th December 2009, 05:16 AM   #488
mkstat is offline mkstat  Austria
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Quote:
Originally Posted by kenpeter View Post

What if one were to line array the front and/or back of a panel
with these transducers? Not exactly down the centerline, but
in a line canted slightly offcenter, for resonant diversity...
Amina had such a design a few years ago (it's currently not on their homepage anymore).
AminaALA102E.jpg
Amina-ALA102E-back.jpg
It's data:
100cm x 20cm x 3,5cm
closed back
180 x 25 HxV dispersion
92dB efficiency
125W (80Hz HP required)
200Hz-20kHz +/-5dB
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Old 23rd December 2009, 07:17 PM   #490
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http://depatisnet.dpma.de/DepatisNet...es=4&pdfpage=1


This is a link to a german patent from 1927. On the pages 3-4 there
are some drawings showing a method how to excite a showcase using
an electrodynamical exciter. The apparatus is intended to use the
showcase for advertisement with speech and music.

Just for your entertainment ...

Kind regards
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Last edited by LineArray; 23rd December 2009 at 07:24 PM.
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