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Multi-Way Conventional loudspeakers with crossovers

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Old 4th February 2009, 02:29 AM   #1
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Default Crossover Layout Comments

Hey guys!

I've finally gotten my component values nailed down and working on the final layout. Here's a pic:

Click the image to open in full size.

Here's a high-res version:

http://picasaweb.google.com/eisenbarth.ma/Crossovers

Tweeter input starts on bottom left, through cap to the inductor on the far left to ground (2nd order) then a resistor dividing network. Output is taken between two resistors on bottom.

Woofer coil starts on bottom right, then a RCL to ground.

Pretty simple.

Any comments? Can I get away with moving things closer together?

Thanks!!
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Old 4th February 2009, 02:36 AM   #2
HK26147 is offline HK26147  United States
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Quote:
Can I get away with moving things closer together?
If you make sure that the inductors are NOT oriented in the same axis ( ie x,y,z ) you minimize magnetic induction and can then move them much closer.
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Old 4th February 2009, 02:38 AM   #3
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I've always kept them 6" apart and ensure that if you look through the hole of one inductor you cannot see another inductor. Always has served me well
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Old 4th February 2009, 02:49 AM   #4
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Man, this topic reminds me of a young girl showing of her behind and asking if the skirt is too short.
Nice tidy job. Fancy coils and resistors. Whats in front of it?
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Old 4th February 2009, 02:49 AM   #5
HK26147 is offline HK26147  United States
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I don't know if you have read AudioXpress 5/01 ( Inductor Coupling ) Dennis Colin:
He outlines a variety of orientation options and coupling results.
Very good article - there was a earlier one that showed the effects of crosstalk on an oscilloscope.
Standard practice is 90 degree orientation and as far apart otherwise
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Old 4th February 2009, 03:35 AM   #6
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Quote:
Originally posted by HK26147
I don't know if you have read AudioXpress 5/01 ( Inductor Coupling ) Dennis Colin:
He outlines a variety of orientation options and coupling results.
Very good article - there was a earlier one that showed the effects of crosstalk on an oscilloscope.
Standard practice is 90 degree orientation and as far apart otherwise

no, but sounds very interesting. I think I can reduce the size a bit.. if I could move the middle inductor down one hole and to the left one position in the grid. Like I said, I usually have things very spread out and haven't tried to really optimize things
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Old 4th February 2009, 03:52 AM   #7
HK26147 is offline HK26147  United States
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Unfortunately I don't have a good link that covers "mutual inductance"
But I'm sure you have seen illustrations of the magnetic flux lines that expand out from the coil torus - the pole orientation is a line down the center of the hole.
The Big foil air core ( on the far right ) shares the same orientation as foil inductor on the far left.
Turn the Big one 90 degree so it's "hole" axis is oriented right to left.
Then all 3 coil are on different axis and can be closer.

( Not to be boring but mutual inductance is the principle behind transformer action )
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Old 4th February 2009, 03:58 AM   #8
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ah. Google helps us here:

http://www.audioholics.com/education...osstalk-basics
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Old 4th February 2009, 04:00 AM   #9
HK26147 is offline HK26147  United States
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You got it!
The article I mentioned "tweaks" upon this.
Good luck
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Old 4th February 2009, 04:45 AM   #10
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Another very good link to this subject

http://www.troelsgravesen.dk/coils.htm

I have actually printed this out and have it above my work bench as an "Aide Memoir"

Regards
Ted
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