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RE: A Question About Series-Parrallel Crossovers

Posted by tomservo (M) on June 26, 2007 at 07:58:30

In Reply to: A Question About Series-Parrallel Crossovers posted by thetubeguy1954 on June 26, 2007 at 05:37:36:

Hi Tubeguy

A series crossover has a minor disadvantage in that the two transfer functions are partially tied together, where as a parallel network, they are fully independent.
What comes out of a speaker system is the acoustic sum of the driver’s responses AND the crossovers, effected by there spacing and geometry so rarely are series networks used anymore.
The impedance of a speaker is a “nominal” number, a speaker is considered an 8 Ohm driver if its minimum impedance falls between say 6 and 9 Ohms, everywhere else, its impedance is higher than that.
They say impedance instead of resistance because unless one has an extremely inefficient speaker, it does not look (electrically) like a resistor, it has variable impedance and is reactive (inductive or capacitive) over nearly all its operating band.
This lack of similarity to a resistor for a load is what made crossover design in the old days so terribly hobbled, formula’s only applied to plain filters driving resistances.
They did not have a way to separate the drivers response from its surroundings (that you can’t fix) and model the drivers magnitude and phase acoustically and electrical side alone, while defining the crossover network.
Best,

Tom

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