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In Reply to: RE: It is also inherent in the panel shape posted by Roger Gustavsson on May 21, 2012 at 22:53:08
I am sorry, but the spring supported tension has no influence at all in the large excursion possibility of the Apogee.
If it were it would have to ad to the sum of moving mass and it is not. It does not move.
There is a good reason to why the springs are there but I won't get in to that as it would be purely educational.
The one who succeeded was the one who didn't know it was impossible.
Follow Ups:
Well, the Apogee patent describes the way it is supposed to work.
Roger Gustavsson
Yes it does. But I think You might have misunderstood it a little bit.
The one who succeeded was the one who didn't know it was impossible.
Jerker (JLindborg) has given me some more insight information. I have to correct myself about the way the Apogee bass is working, the patent is not very clear on some points.
The bass diaphragm is tensioned, heavily tensioned in one direction, across the short dimension, with the help of springs. The springs are there to take up any variations caused by temperature, ageing etc., not to introduce a suspension. This is also a reason to why the panel can warp with time. As the diaphragm is corrugated in the other direction (top-to-toe), it can move rather freely. The tuning is held by the springs, giving some stiffness across the diaphragm. The damping strips of soft foam around the edge also let the diaphragm move a bit. Unfortunatley, the foam use to detoriate.
Roger Gustavsson
However, Analysis Audio DOES have a rubber suspension of some sort around their Apogee like bass panel.
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