series woofer inductor. Lower DCR is better ? - diyAudio
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Old 18th December 2015, 05:29 PM   #1
Swarky is offline Swarky  Spain
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Default series woofer inductor. Lower DCR is better ?

My 2-way has a 0.76mH iron-core series woofer inductor with DCR 0.2R. Might changing to a Jantzen air core with 0.17R be a good move or as a technical friend says "a coil is a coil " ?

Last edited by Swarky; 18th December 2015 at 05:33 PM.
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Old 18th December 2015, 05:34 PM   #2
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Lower dcr makes the woofer LF stronger (when considering the room and crossover, all).
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Old 18th December 2015, 06:02 PM   #3
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Quote:
Originally Posted by Swarky View Post
My 2-way has a 0.76mH iron-core series woofer inductor with DCR 0.2R. Might changing to a Jantzen air core with 0.17R be a good move or as a technical friend says "a coil is a coil " ?
'Better' is not necessarily the case. Sometimes, a higher DCR can reduce the peak that results from a large lowpass coil in relation to the driver's Fs. Sometimes, a larger DCR can be beneficial in balancing the levels of the woofer compared to the tweeter. Changing DCR on the lowpass can actually change the woofer's box response profile- moreso when more of a change in DCR.

That said-

0.2 to 0.17 ohms is likely not much of a difference to make a change for better/worse.

Often times, less resistance will allow a driver to sound more open and unrestrained. You can test this just adding resistance to a pair of speakers and see/hear for yourself.

In a tweeter circuit, I had a lower DCR coil + resistance that matched a higher DCR coil's DCR; and the larger wire coil and resistor sounded better.

Your mileage may vary,
Wolf
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Old 18th December 2015, 06:08 PM   #4
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The difference between 0.2 ohms and 0.17 ohms in series with a 8 ohm or 4 ohm woofer is miniscule. But the difference between an air-core or iron-core inductor could be significant under some circumstances.

An iron core is used to concentrate the magnetic field produced by current through the coil. This allows a higher inductance while using less copper wire, and is a cost-effective way of achieving higher inductance while keeping dcr low. The alternative is an air core coil with more turns and thicker wire.

But this only goes so far. At higher currents the magnetic field will saturate the iron core and this will change the inductance. Air core inductors do not saturate, so the inductance value is stable even at higher currents.
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Old 18th December 2015, 06:14 PM   #5
Lojzek is offline Lojzek  Croatia
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Quote:
Originally Posted by Swarky View Post
My 2-way has a 0.76mH iron-core series woofer inductor with DCR 0.2R.
Might changing to a Jantzen air core with 0.17R be a good move or as a
technical friend says "a coil is a coil " ?
Depends what you perceive as a good move. Let's assume you make a
fancy looking XO filter, place it out of the cabinet in a transparent box so
everyone enjoys the view and than your friend(girl), who happens to be
an audiophile, sees it, falls in love with you right away. Surely that would
be a good move, at least for awhile or maybe not.
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Old 18th December 2015, 06:48 PM   #6
Swarky is offline Swarky  Spain
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Not another girlfriend falling in love with me, please although I must admit Ive never had an audiophile one. After so many Im tired of that. Music is much more rewarding in the long run.
Seriously, I have changed the resistors for Mills and the series tweeter poly caps for teflon (Russian FT3) and PIO WBGO-2. I like what I have achieved so far and just thought I would "upgrade" the rather homespun series coils I have for something, hopefully a little better. A bit more bass presence would be nice from my closed boxes (WD25TEx).
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Old 18th December 2015, 07:13 PM   #7
Lojzek is offline Lojzek  Croatia
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Quote:
Originally Posted by Swarky View Post
After so many Im tired of that.
Of course you are and you should be. They were the wrong ones.

Quote:
Originally Posted by Swarky View Post

A bit more bass presence would be nice from my closed boxes (WD25TEx).
Say again! Is there any rule that sais you can't turn your closed box
into a ported one? How about electronic aids.
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Old 18th December 2015, 07:28 PM   #8
Swarky is offline Swarky  Spain
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Yes, and Ill chop my head off when I feel a headache coming on.
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Old 18th December 2015, 07:33 PM   #9
Lojzek is offline Lojzek  Croatia
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That would launch you in a greater trouble than you were in.
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Old 18th December 2015, 07:39 PM   #10
Lojzek is offline Lojzek  Croatia
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Quote:
Originally Posted by stevebogus View Post

But this only goes so far. At higher currents the magnetic field will
saturate the iron core and this will change the inductance.
Yes, and beside that your driver will be ready to be sent to a cemetary
due to burns of 3rd degree.
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