Ferrite Coils for passive crossovers?

N

Norm Dresner

Guest
What would be the likely result of using a ferrite-core coil in a
loudspeaker passive crossover instead of an air-core? I'm interested in
both the theoretical and practical aspects of this and was hoping that
someone would know and save me the trouble of winding some coils just to
find out.

TIA
Norm
 
Norm Dresner wrote:

What would be the likely result of using a ferrite-core coil in a
loudspeaker passive crossover instead of an air-core? I'm interested in
both the theoretical and practical aspects of this and was hoping that
someone would know and save me the trouble of winding some coils just to
find out.

TIA
Norm

The obvious thought is that the ferrite would saturate and create weird
Click to expand...
harmonics, or that you'd have problems with the repeatability of the
inductor value and inductance changes with temperature.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
 
The inductance varies with current, so you'll see your cutoff frequencies
dithering with the bass.
I don't know if that would be audible or not, but given what's claimed to be
audible in those circles, it wouldn't surprise me.

--
KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR
 
"Dave VanHorn" <dvanhorn@cedar.net> wrote in message
news:CuidnSKwD4C6d6bcRVn-qQ@comcast.com...
The inductance varies with current, so you'll see your cutoff frequencies
dithering with the bass.
I don't know if that would be audible or not, but given what's claimed to
be
audible in those circles, it wouldn't surprise me.

--
Click to expand...
Nevertheless, even if it's not commercially viable, it might be good enough
for Q&D testing at low volume levels where the cores won't saturate. I
think I'll give it a try.

Norm
 
"Norm Dresner" <ndrez@att.net> wrote in message
news:nsO_c.557488$Gx4.114914@bgtnsc04-news.ops.worldnet.att.net...
What would be the likely result of using a ferrite-core coil in a
loudspeaker passive crossover instead of an air-core? I'm interested
in
both the theoretical and practical aspects of this and was hoping that
someone would know and save me the trouble of winding some coils just
to
find out.

TIA
Norm
Click to expand...
Coils with anything other than air core have to be very large to prevent
saturation, because of the high power. And then you you have to deal
with the nonlinearities of the B-H curve. Just use air core and forget
it.
 
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