Mac Kerr wrote on Sat, 29 January 2011 12:25 |
Art Welter wrote on Sat, 29 January 2011 14:01 | McGraw-Hill Science & Technology Dictionary defines Transient Response as: “The behavior of a system following a sudden change in its input.”
Wikipedia: “In Electrical Engineering and Mechanical Engineering, a transient response or natural response is the response of a system to a change from equilibrium. Specifically, transient response in Mechanical Engineering is the portion of the response that approaches zero after a sufficiently long time (i.e., as t approaches infinity). “
But even looking at the transient response at the start of a signal, there are differences that can be observed between woofers. A 10” woofer with a powerful magnet can accelerate a light cone faster at the onset of a signal than an 18” heavy cone woofer with a weak magnet. The former would have better transient response than the latter.
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Of course, there are no sudden changes in input in a sub. All changes are gradual because of the LPF eliminating those pesky rapid changes. Obviously there can be mechanical systems that are so slow in response that even a relatively slow change to the input of the system can't be accurately tracked by the output. Since it is a case of the output not tracking the input I suppose that could be thought of as transient response. It isn't transient response in the sense that that term has in any other part of the system.
Mac
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An underdamped woofer can persist in movement for several cycles after the signal is stopped, an example of a electro mechanical system that is so slow in response that a change to the input of the system is not accurately tracked by the output.
I guess we have a different idea of what "sudden changes" are.
100 "changes" a second is not sudden?
Of course, that 100 changes would be only the upper fundamental frequency, when a woofer is responding to a musical signal, there are multiple frequencies involved, the "changes" it needs to respond to are in the thousands.
When are changes sudden, at 1000, 10,000 Hz ?
How does transient response apply to one set of frequencies and not to another?