On Wed, 17 Jan 2007 20:25:18 +0000, Eiron wrote:

Serge Auckland wrote:
Don Pearce wrote:

Without being able to trace the circuits I can't say for definite, but
that looks like a second order crossover. Are those chokes wound on
ferrite? If they are, this crossover has a power limit set by the
magnetic saturation of the ferrite. Your other one is a better way of
making a crossover choke.

Completely agree.

Are there any real test results showing the difference between
air and ferrite cored inductors in a crossover or is it another
evanescent chalk and cheese effect?

I can't think of any, but the signal levels involved are similar to
those in valve output transformers - think how big they have to be to
achieve even their limited degree of linearity. The parallel is not
exact, of course, because these are rods, not closed cores, so in
essence they incorporate a huge air gap. Nevertheless you are dragging
the magnetic flux up and down the standard B/H curve of a piece of
magnetic material, and that just can't be as good as using plain air.

d

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Pearce Consulting
http://www.pearce.uk.com