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Date: August 05, 2003 at 15:45:23
From: Brian, [206.48.63.223]
Subject: Re: °°°Types of Distortions °°°


>I've found that on all drivers, distortion rises as
>they near their mechanical resonance region. This is
>primarily a result from the magnetic structure, and
>not the suspension or the diaphram.

I somewhat agree here.

With all drivers, the more excursion the driver is asked to perform, the more distortion you can expect to get.

For example, consider a free-air (or infinite-baffle) system. If power input is kept the same while the input frequency drops, the driver's cone will undergo increased excursion. With that increased excursion comes increased distortion. This distortion can be caused by a nonlinear motor, and/or a nonlinear spider/surround combination.

Now, let's put that driver in an acoustic suspension alignment. With this type of alignment, the air in the box exerts greater control over the driver's excursion than the driver's spider/suspension. Distortion due to these factors might therefore decrease. However, distortion due to a non-linear motor will not.

As a result, generally speaking you can expect distortion caused by the the suspension to form a greater part of the overall distortion as the alignment approaches an infinite-baffle type of configuration (e.g. free-air, very large box, or even vented systems below Fb).


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