Depending on what the impedance differences are at the point where the speaker impedance is sagging and the amplifier impedance is rising, and whether or not it is a positive or negative differential, the most likely results would be an increase in power draw from the amp with a lack of control and poorer transient response.
As the impedances match, power output "should" theoretically increase to maximum and transient response should be perfect. That is, if the amp was properly built and designed. Since such is not the case in the real world, the problem with this is that the output of the amp can now be "modulated" by the reflected EMF of the loudspeaker to a much greater degree. In effect, the speaker is no longer acting as a power sink for the amp so much as there is an even exchange of power taking place between the two devices. The end result of this is a lack of control. This "lack of control" can also cause non-linearities in the amplifier to increase, resulting in oddball distortions and poorer transient characteristics.
While this could take place at any given frequency at any given time, the fact that low frequencies require the greatest amount of driver excursion also means that low frequencies generate the greatest amount of reflected EMF from the speaker. This is why "sloppy bass" is such a common factor in system sound, especially with speakers that lack self-damping and tend to "ring" as it is. As has been previously noted in other threads, a sealed and stuffed speaker design is typically miles ahead in terms of transient response and self-damping as compared to other common vented designs.
I would suggest looking at the white papers that Bob Carver has published pertaining to the original Sunfire subs. He talks about reflected EMF and what it takes to overcome such things AND keep the amplifier in control at all times. This is NOT to say that i have great faith in the Sunfire sub as a product and end result of his understanding of the subject, only that there is a great amount of thought that went into it. There are many products that aren't what they should be given the amount of knowledge and technology that the designer had available to them.
Other than that, the original subject as posted by Newbee is a very complex matter and could be a great source for learning about the interface between amplifiers, loudspeakers and loudspeaker cabling as they interphase with each other. Sean
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As the impedances match, power output "should" theoretically increase to maximum and transient response should be perfect. That is, if the amp was properly built and designed. Since such is not the case in the real world, the problem with this is that the output of the amp can now be "modulated" by the reflected EMF of the loudspeaker to a much greater degree. In effect, the speaker is no longer acting as a power sink for the amp so much as there is an even exchange of power taking place between the two devices. The end result of this is a lack of control. This "lack of control" can also cause non-linearities in the amplifier to increase, resulting in oddball distortions and poorer transient characteristics.
While this could take place at any given frequency at any given time, the fact that low frequencies require the greatest amount of driver excursion also means that low frequencies generate the greatest amount of reflected EMF from the speaker. This is why "sloppy bass" is such a common factor in system sound, especially with speakers that lack self-damping and tend to "ring" as it is. As has been previously noted in other threads, a sealed and stuffed speaker design is typically miles ahead in terms of transient response and self-damping as compared to other common vented designs.
I would suggest looking at the white papers that Bob Carver has published pertaining to the original Sunfire subs. He talks about reflected EMF and what it takes to overcome such things AND keep the amplifier in control at all times. This is NOT to say that i have great faith in the Sunfire sub as a product and end result of his understanding of the subject, only that there is a great amount of thought that went into it. There are many products that aren't what they should be given the amount of knowledge and technology that the designer had available to them.
Other than that, the original subject as posted by Newbee is a very complex matter and could be a great source for learning about the interface between amplifiers, loudspeakers and loudspeaker cabling as they interphase with each other. Sean
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