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In Reply to: Re: Is a 12db slope good enough for an active x-o? posted by neolith on March 30, 2007 at 17:09:18:
Hey Neo,Fogive my ignorance here.
Is it necessary to wire them out of phase if both the low and high passes are 12db. Or is it always required when a 12db slope is used regardless of what other slopes are used?
I can see if one is 6db and the other 12db, but why the need if both ar 12db slopes?
Follow Ups:
It is most important to "phase align" or "phase correct" 2nd order crossovers because of the phase change.
The phase relation is independent of the slope or Q of the filter. Note also that while we use 2nd order and 12db interchangeably, only a Butterworth (Q=sqrt of 2) is down 12db at one octave. The L-R as shown here is down ~13.7 db at the octave reflecting its softer slope.
I may be an egoist but at least I don't talk about other people.
I guess I am really clueless on this.How do a second order high pass and low pass end up with different phases?
I will email you with a more detailed explanation but you may want to check out Mart's excellent article on basic circuits in the Articles section of this forum.
I may be an egoist but at least I don't talk about other people.
k
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