How to wire inductor in crossover??PICS*

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This is the crossover I am using for a DIY center speaker.
This is my first so now that I have the parts, I am confused as to which way to wire the crossover components. I know what goes where of course, but for the inductors...Do I use the outside wire for the input and the unside wire for the output to the speaker...visa versa...or does it not matter at all?
http://www.partsexpress.com/projectshowcase/cynosure/crossover.jpg

some pics of what I am talking about. Does the input wire go to the inside or outside wire?


An externally hosted image should be here but it was not working when we last tested it.


<a href="http://img201.imageshack.us/my.php?image=inductorff5.jpg" target="_blank"><img src="http://img201.imageshack.us/img201/4452/inductorff5.th.jpg" border="0" alt="Free Image Hosting at www.ImageShack.us" /></a>

Thanks everyone,
Dominick
 
No, either wire is fine.

For stereo, what the hell make them both the same, but the parasitic elements (winding capacitance, leakage, etc) are very small for most passive devices and can almost always be ignored.

If there are multiple inductors in your design do not place the windings so that they are in line or parallel. 90 degrees is what you want, this means if one is vertical, you can have only three inductors maximum, unless you leave some space. Maybe three or better four times the largest dimension for inductors in alignment, more if you can spare the space.

Two inductors near each other are called a transformer.
 
rabbitz said:
I have read some information where it is suggested to wire air core inductors with the input to the inner wire and output from the outer wire.

Just passing along the info.
Do you recal if a reason was given? I am most curious.

Capacitors have an outer foil attached to one lead and some have been said to have a somewhat different sound when connected one way or the other. So its not unusual to see a schematic where they are marked for direction. I don't recall ever seeing an inductor (other than the very speciallized with a built in permanent magent) marked for orientation or polarity.

If there is an advantage of one way over the other I'd like to know as I am currently building quite a complex crossover that has 7 inductors in it.
 
There was no reason given but had a comment on inductor polarity... "Please observe for optimum audio performance" and then showed the correct method.

This was from a well respected professional loudspeaker designer who offers a design service, kits and completed products so is very experienced.

I've been wiring mine that way since and even though I have never tested it, surely can't do any harm.
 
Cal Weldon said:


Inductor polarity?

Interesting.

It is, isn't it. Here's the info with the advice on polarity (see pic).
 

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yes rabbitz,

I was kidding! Great pic post though. Sometimes, noobs like me enlighten the vets with me simple questions. I bet most people think that their is absolutly no difference simply because they never asked.


Thanks a ton for helping my project be a success.


By the way, I posted the finished center speaker at

Center Channel *PICS* under the loudspeaker forum.

Dominick
 
Dominick22 said:
I bet most people think that their is absolutly no difference simply because they never asked.

I don't think that's the reason Dominick. I think the reason is that in an AC circuit where the current has to flow both ways through the choke it seems a little odd that someone can claim there is a right and wrong way.

My two cents.
 
The connection of the inductor would make a difference if you're trying to align them in a specific orientation to couple them, but in general it won't make squat all difference electrically.

In sound terms it will make a difference if you think it makes a difference ;)

The output of an amp is AC, however much the purveyors of snake based liquids try to claim.
 
rabbitz said:


It is, isn't it. Here's the info with the advice on polarity (see pic).


I could be wrong but judging from the photo the current on both inductors (parallel and series) enters the coil from the outer wire (B) and exits from the inner wire (A). I am assuming here that the connectors in the pic are inputs from the amplifier (terminal cups).
 
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