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Old 24th November 2010, 05:52 AM   #1
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Default Inductors

Hello all, I am wanting to rebuild/design some crossovers that I have in a pair of commercial speakers. What is the general rule about inductors. How far off in each direction can I go with the DCR without effecting the sound noticeably? I heard it's ok to go lower by any amount but you don't want to go higher by much. I thought I would check before buying. Is it acceptable to go off the mH a little? Reason I ask is because I'm trying to save a bit where I can.

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Dan
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Old 24th November 2010, 02:07 PM   #2
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Better you post your xover layout/and speaker drivers model (w. positions for all inductors and value), together with decisions you make before you buy.
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Old 24th November 2010, 02:54 PM   #3
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Yeah, it depends if the inductors are in series or parallel. You also want to watch their saturation power unless you use air core which don't saturate (but have a higher DCR).

Standard advice #17: speakers last a LONG LONG time, spend the money and do it right. (But it's true, sometimes you can use a slightly different standard coil and save money and maybe reduce DCR).
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Old 24th November 2010, 03:06 PM   #4
sreten is online now sreten  United Kingdom
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Hi,

In rebuilding commercial speakers its simply not worth "upgrading" the
inductors unless they are very poor or underated in power handling.

In any good design the DCR of the inductors will be included in the balance,
reducing the DCR of the inductors should have no positive effect.
The main thing to do is replace any electrolytics with modern ones, and
possibly replace any electrolytics in critical positions with film types.

rgds, sreten.
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Last edited by sreten; 24th November 2010 at 03:10 PM.
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Old 24th November 2010, 04:14 PM   #5
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http://www.polkaudio.com/forums/atta...4&d=1155785202

Here is a link to what I'm going for. I have the original ls90 which the general said has undefined bass that is muddied and "wooly" midrange. So Polk changed it to this crossover and everyone was happy. The original, mine, have a 4.0 mH inductor in place of the 1.0 mH, the cap was changed from an electrolytic to Mylar but I'm going poly, and the resistor went from a 1.5 ohm I believe to the 1 ohm. Layout is identical. All are iron core with the exception of the .4 mH

Dan
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Old 24th November 2010, 04:29 PM   #6
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If you want to go with air core coils, manufacturers like Solen have coil charts that give wire gauge and DCR. Usually upsizing from 16 to 14 gauge is only a couple dollars per coil
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Old 24th November 2010, 05:05 PM   #7
sreten is online now sreten  United Kingdom
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Click the image to open in full size.

Hmmm.......

Very simple crossover, and changing 4.0mH to 1.0mH changes it from
a 2.5 way to IMO a very poor 2 way, I've no idea what is going on.

rgds, sreten.

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Old 24th November 2010, 05:25 PM   #8
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Well I'm completely open to redisigning the whole crossover and doing point to point. Any ideas Sreten? That is actually what I would prefer to do. If needed I can ship out a woofer and tweeter so someone can get ts params.

Dan
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Old 24th November 2010, 09:17 PM   #9
sreten is online now sreten  United Kingdom
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Quote:
Originally Posted by saabracer23 View Post
Well I'm completely open to redisigning the whole crossover and doing point
to point. Any ideas Sreten? That is actually what I would prefer to do. If
needed I can ship out a woofer and tweeter so someone can get ts params.

Dan
Hi,

All the info as to how do that is contained in the links I posted.
TS parameters are only for the bass, you ideally need FR curves.
In box is a lot better and easier than large baffle measurements.

rgds, sreten.
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Last edited by sreten; 24th November 2010 at 09:29 PM.
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Old 24th November 2010, 10:35 PM   #10
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Quote:
Originally Posted by saabracer23 View Post
Well I'm completely open to redisigning the whole crossover and doing point to point. Any ideas Sreten? That is actually what I would prefer to do. If needed I can ship out a woofer and tweeter so someone can get ts params.

Dan
Dan,
Have some patience and take your time.
From my point of view (if the speaker/drivers are the same), and you want to do the improvements/changes said, you will need a new xover. New R1, C1 and new L3.

L1 and L2 are the same, but, you can buy new ones to have a brand new plug-in xover and be able to compare.
You may have to get used to the idea that, you might have to change some of the components from final design, for your likings/room/amp etc.
Now let's check all the components one by one (air core/DCR, etc.) wherever you want to start.

If you want to just buy the new components R1, C1 and L3 you will have probably less work. Start with the tweeter and compare before changing the woofer coil. Then solder the new coils and check for final testings. You have L value and DCR listed. The HF change will pad it a little. The LF change will make it more lively. You can also change DCR for L2 to balance the Mids. More DCR = more attenuation on "lower frequencies".

Mr. Polk will be proud of you (in his secret island).

Last edited by Inductor; 24th November 2010 at 10:51 PM. Reason: Balance the Mids
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