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Old 27th August 2006, 01:18 PM   #21
rabbitz is offline rabbitz  Australia
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The wires on the inductor are twisted together so you can't see which is which but "A" is the inner which comes from the +ve terminal. The larger inductor on the left is the one for the woofer and the top is for a 2nd order on the tweeter.
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Old 27th August 2006, 04:12 PM   #22
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Originally posted by rabbitz
The wires on the inductor are twisted together so you can't see which is which but "A" is the inner which comes from the +ve terminal. The larger inductor on the left is the one for the woofer and the top is for a 2nd order on the tweeter.
Well, I knew "A" is the inner cable as stated by the text in the pic

Otherwise it's indeed difficult to tell which is which on that picture.

I was pleasantly surprised to see this inductor polarity question being raised here, for years I had thought I was the only soul in this world who had ever wondered if current direction in coils actually mattered. Techies I have talked to unanimously agree that it makes no difference but I only spoke to two of them so my "poll" was hardly statistically reliable.

My interest in the question was spawned years ago when I noticed that one of the air cored Solen inductors in one of my Linn's crossover was wired differently than the others. This puzzled me since the inductors on the other speaker's crossover were all wired the same way. The speakers sounded fine but nonetheless I vaguely suspected that single malt indulgence at the factory may have had something to do with this, however my reversing of the wiring produced no difference in sound whatsoever. Regardless, I have been seeking a definitive answer to coil polarity ever since.

Info on the Net regarding this matter is rather scant; there are a few references to non polarized inductors but none of the coils the info pertained to were of the type used in crossovers. I was hoping to find authoritative statements such as "inductors are non polarized" or vice versa but no such luck. The picture posted in this thread is the first online document I have ever seen to directly address the issue. But now I'm even more intrigued because the wiring as described in the photo is opposite the Linn's. But on the other hand, I have seem other high end speakers with coils wired the other way.
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Old 28th August 2006, 11:27 AM   #23
rabbitz is offline rabbitz  Australia
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I think it will always remain a mystery and the best bet is to wire them all the same using what ever method.

That's the only document I have ever seen that mentioned it.

Good luck in your search for more info on it.
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Old 28th August 2006, 02:46 PM   #24
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Originally posted by rabbitz
[B]I think it will always remain a mystery and the best bet is to wire them all the same using what ever method.
My thinking exactly.

Quote:
That's the only document I have ever seen that mentioned it.
And for that reason I'll wire the coils as per the document for the time being. I finished soldering a crossover that way last night and even though I can't swear it sounds better than the other one I had wired in reverse polarity, so to speak (with the current exiting from the inner wire), I can't say it sounds worse either. Imaging remains stable. I will nonetheless rewire it so that both match the document's polarity. I figure the worse that can happen is that it makes no difference.
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Old 28th August 2006, 04:24 PM   #25
hermanv is offline hermanv  United States
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Originally posted by BlackCatSound ...edit...
The output of an amp is AC, however much the purveyors of snake based liquids try to claim. [/B]
Since most audio systems have a frequency response that drops off below 20Hz, it is true that the signal to a speaker is AC.

Still it can be quite an interesting discussion, many instuments are not AC: for example you blow air into horns never the other way around, an analysis of their acoustic output signal shows a strong DC component. Additionally there is the perenial question of absolute phase of the music. If it were truly AC that question wouldnt exist.

My system has an absolute phase switch, I've experimented many times. It changes how the music sounds. Although I have never been able to tell which position is absolutely correct (for a given recording) I can tell you that one way guitars are more forward and horns a little blattier, but I can not tell if this is this the right or wrong polarity.

Wait. isn't this where I came in? Polarity on an AC signal?
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Old 29th August 2006, 07:13 AM   #26
rabbitz is offline rabbitz  Australia
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Originally posted by Willitwork


I will nonetheless rewire it so that both match the document's polarity. I figure the worse that can happen is that it makes no difference.
I think it comes under the category of making one feel good even if there is no sonic value, but there's nothing wrong with feeling good.
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Old 29th August 2006, 08:31 PM   #27
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Originally posted by rabbitz
I think it comes under the category of making one feel good even if there is no sonic value, but there's nothing wrong with feeling good.
Bingo!
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