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PostPosted: Sun Feb 19, 2017 8:21 am 
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Location: Quebec, QC, CA
I,m considering upgrading the MAgneplanar 1.7 crossover. The original design come with 1.4mH inductor.

this value is not commun....1.5 mH is easy to find.

what should I do?? Do 1.5mH will be ok?

Shoud I buy 2 inductors 0.7mH and wire them in paralel?


Thanks for the help!


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PostPosted: Sun Feb 19, 2017 8:56 am 
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I would buy the 1.5 and either adjust the capacitor value using the resonance calculator or the other option is to remove some wire until the value is matched. It's easier to do if you have an inductance meter or inductance range on your multimeter.

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PostPosted: Sun Feb 19, 2017 8:59 am 
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Location: Milton, ON, CA
What he said. Or you could have it custom wound.


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PostPosted: Sun Feb 19, 2017 9:05 am 
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Location: Kitchener, ON, CA
The resistance of the coil is generally factored in the crossover design so "upgrading" to a better coil may have adverse effects. I would upgrade the capacitors but but leave the stock coil.


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PostPosted: Sun Feb 19, 2017 9:13 am 
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Location: Eastern Passage, NS, CA
renehuot70 wrote:
I,m considering upgrading the MAgneplanar 1.7 crossover. The original design come with 1.4mH inductor.

this value is not commun....1.5 mH is easy to find.

what should I do?? Do 1.5mH will be ok?

Shoud I buy 2 inductors 0.7mH and wire them in paralel?


Thanks for the help!


Usually, upgrading capacitors will sometime make an improvement, depending which brands one is using, and how old the speakers are.

If there is nothing wrong with an inductor, will they be an improvement in sound quality if a different brand is used? I don't think so, but I might be wrong. Somebody else with more tech knowledge might be able to answer that.

When I redid the cross-overs in my AR 18, and 91, all caps where replaced due to the capacitors drying out after 36 years. It usually causes the value to diminish and its equivalent series resistance (ESR) to increase until it is no longer passing any signal. This can happen slowly over time and may go unnoticed until gone completely. So with 20 to 40 years old speakers, it's best to upgrade the capacitors, with the same original values. I left the inductors and the coils alone; to me there was no need to change/replace them.

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PostPosted: Sun Feb 19, 2017 11:00 am 
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Unless the inductor is damaged leave it be, just consider it "well broken in" :) otherwise have Solen wind up some new ones. 2x .7mH in parallel equals .35mH btw


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PostPosted: Sun Feb 19, 2017 11:04 am 
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Zedguy wrote:
The resistance of the coil is generally factored in the crossover design so "upgrading" to a better coil may have adverse effects. I would upgrade the capacitors but but leave the stock coil.


+1


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PostPosted: Sun Feb 19, 2017 11:26 am 
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Michael F wrote:
Unless the inductor is damaged leave it be, just consider it "well broken in" :) otherwise have Solen wind up some new ones. 2x .7mH in parallel equals .35mH btw
+1. You'd have to connect them in series, which would raise DCR, possibly above the current choke's value.

Is there something wrong with these that they need replacing?

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PostPosted: Sun Feb 19, 2017 11:31 am 
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Location: kanata, ON, CA
Cut to the chase and go directly to Magnepan. They will direct you to what's best for your MG1.7s.

http://www.magnepan.com/


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PostPosted: Mon Feb 20, 2017 6:23 pm 
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Location: New Westminster, BC, CA
Doubt you would notice much difference between 1.4 and 1.5, all else being roughly equal. However, if the replacement is lower gauge/ lower DCR, you might. Haven't compared Litz and foil types at that size and doubt that I ever would - too rich for me.


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PostPosted: Wed Mar 01, 2017 4:00 pm 
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Location: Burlington, ON, CA
renehuot70 wrote:
I,m considering upgrading the MAgneplanar 1.7 crossover. The original design come with 1.4mH inductor.

this value is not commun....1.5 mH is easy to find.

what should I do?? Do 1.5mH will be ok?

Shoud I buy 2 inductors 0.7mH and wire them in paralel?


Thanks for the help!


If you have an inductance meter or DMM, buy the 1.5mH and unwind the wire until you reach 1.4mH. You can also calculate the # of turns that need to be removed but measuring is obviously the preferred method.

Having said that, I agree with the other comments regarding minimal benefits (if any) from replacing the inductors.

Mark

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PostPosted: Wed Mar 01, 2017 4:56 pm 
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I will leave the choke.....I will upgrade the caps

thanks to all :D


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