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Old 6th November 2002, 01:53 PM   #1
Raka is offline Raka  Europe
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Default Impedance curve shape

Hi all,

I have a question

Is the impedance curve shape what matters or only the valley value?
I understand that if a too low impedance value is presented to the amp, the available current output couldn't be enough . So this has to be considered for the amp.
But, what if the shape is up and down all the time without getting too low values?? This won't put any stress in the amp, but this would mean that different frequencies would produce different current values, wouldn't it? Does this affect the sound?

I'm not talking about the crossover, but about the resulting load presented to the amp
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Old 6th November 2002, 02:07 PM   #2
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Drivers and speakers are made to produce constant sound output at a constant drive voltage. Well-designed amps will do a remarkably good job of providing a constant-voltage source (i.e., low source Z) to a load with an impedance that varies across the frequency band of interest, assuming the speaker designer hasn't done something stupid like have the |Z| drop to ridiculously low values.
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Old 6th November 2002, 07:11 PM   #3
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For the most part, the amplifier doesn't have much
problem with this, and usually an impedance dip over
a small degment of the frequency band is not a problem.

Impedance variations are more of an issue for passive
crossover networks, another reason I prefer active
crossovers.
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Old 7th November 2002, 08:42 AM   #4
Raka is offline Raka  Europe
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Default Speaker system behaviour

Thanks for your input, boys

Always thinking in a theorical plane, the speaker system should behave in a same way for all the frequencies, right? My question is: Are they only voltage dependant?
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Old 8th November 2002, 01:28 AM   #5
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Default Towards Purely Resistive Load....

In my experience most high NFB amps do not like rising impedence inductive loads.
Inductance represents stored energy that flings back at the amp.
Carefull tuning of Zobel networks at drivers, amp output and speakerbox input helps sonics bigtime.

Eric.
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