Quote:
Ricci wrote:
 Thank you for the explanation Illka. I figured that it was distortion related to the suspension,but I'm no expert.Now I know and knowing is half the battle.
Do you think that the 30mm linear xmax rating for the SDX is a bit optimistic, or would that be unrelated to the distortion issue? |
Can't really tell without Klippel or similar measurement, but when one remembers that...
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Xmag = Excursion limit due to the magnetic limitations of the driver's motor. Xmag is defined as the displacement at which the BL product has fallen to 70.7% of its value at the cone's rest position.
Xsus = Excursion limit due to the driver's suspension. Xsus is defined as the point at which the compliance of the suspension has decreased to 25% of the value at the cone's rest position.
From these two figures, Xmax is then derived as follows:
Xmax = The shorter of the Xmag and Xsus values, in each direction of cone travel.
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...so linear doesn't usually really mean perfectly linear, so there can be a lot of distortion even when still operating under "linear" range. I wouldn't worry about sub 20 Hz distortion that much though.