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Old 16th December 2007, 06:40 PM   #1
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Default Best coil for crossover

Searching this forum I could not stop to wonder which coil I should use for the Zaph's SR71 parallel-bass coil.

The value is 3.3mh, the coil is used till 1750Hz. If I use and air-coil the resistance would be too high.

Wich core coil should I use, I have the options of a Tritec/Ferrobar coil, the HQ58 coils from InterTechnik, a Ferrobar coil, a torobar coil and a torobar coil.

What's the difference except the minor differences in the resistance?
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Old 16th December 2007, 10:09 PM   #2
tinitus is offline tinitus  Europe
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You would usually use a copper foil aircore, but because of the size(3.3mH) it may be better to use a toroid inductor
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Old 17th December 2007, 09:45 AM   #3
sreten is offline sreten  United Kingdom
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Copper Foil Air core ? Toroid ? - both very unsuitable.

Quote:
I used a Madisound Sledgehammer 15 AWG
steel laminate for the primary woofer inductor.
The primary difference between cored types is the core size. I'd say
Zaph would go for the best apparent price / performance option.

/sreten.
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Old 17th December 2007, 10:58 AM   #4
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I can't get the Madisound Sledgehammer 15 AWG...

I can order at Speaker&Co and Capsandcoils, there both located in the Netherlands. This would safe me some shipping-costs as well as the trouble of converting Euro to US-Dollars.

But the Slegdehammer 15AWG has a ferrite core, or an iron one? And why should I not use Tritec/ferrite coil or the HQ58 coils from Intertechnik?
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Old 17th December 2007, 12:07 PM   #5
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by hpolkerman

But the Slegdehammer 15AWG has a ferrite core, or an iron one?
Hi,

What part of steel laminate do you not understand ?
All cores have iron in them ......

If you cannot be bothered to provide details of the coils you
are asking about, I cannot be bothered to find said details.

/sreten.
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Old 17th December 2007, 12:16 PM   #6
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The main problem is that I can't get the Sledgehammer, and I want to know which coils is a good replacement for the Sledgehammer.

Cores are made up of different materials of iron; ferrite, copper(corrobar) even wood and plastics.

Which is a good replacement, which core should I look for?
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Old 17th December 2007, 12:36 PM   #7
tinitus is offline tinitus  Europe
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I dont see why a toroid would be unsuitable, well DCR is a bit on the low side ... its about 30EUR


There is also an IT, i-PUNKT, 3.3mH, DCR 0.21, 23EUR, iron with grainoriented silicium

Super Q from Caps&Coils should be fine too
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Old 17th December 2007, 02:41 PM   #8
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by tinitus
I dont see why a toroid would be unsuitable, well DCR is a bit on the low side ... its about 30EUR
Hi, unless its air gapped, so not strictly a toroid, its not suitable, /sreten.
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Old 17th December 2007, 02:53 PM   #9
tinitus is offline tinitus  Europe
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As far as I know they are airgapped or with laminated core or the core contains air to act like airgap - they have the advantage of not "talking" with other inductors, no or less strayfield
Aircore would be the best, but not possible here
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Old 24th March 2008, 02:30 PM   #10
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Quote:
Originally posted by hpolkerman
The main problem is that I can't get the Sledgehammer, and I want to know which coils is a good replacement for the Sledgehammer.

Cores are made up of different materials of iron; ferrite, copper(corrobar) even wood and plastics.

Which is a good replacement, which core should I look for?

I'm not trying to answer your question here as my self is having similar question...

I'm actually looking for the coil as well for speaker x-over and found 2 type of cores for the coils which are air core and magnet core. As far as I know the main advantage using air core coil is much less saturation distorsion and hysteresis loss compare the iron, ferrite or magnet. But on the other hand the trade off would be the bigger size (not a problem if we have enough space to accomodate) and higher resistance compare the other type of cores.

With all characteristics of each cores, if we use proper ferromagnetic core for the purpose (very little hysteresis loss/ saturation distorsion) rather than the air core, is the different sound signature between those 2 cores audioable?

Does anyone have an experience on this when comparing both types of cores?

I understand it would be 'hard' to compare as most likely they have different wire, size...etc but at least I just want to know the main different between ferromagnetic core and air core sonically..

Thanks,

Joshua
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