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Old 18th July 2002, 07:34 AM   #1
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Default AlphaCore Copper Foil or Solen Hepta-litz ???

which would you use/prefer for speaker crossovers?
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Old 18th July 2002, 07:49 AM   #2
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Default Re: AlphaCore Copper Foil or Solen Hepta-litz ???

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Originally posted by bbaker6212
which would you use/prefer for speaker crossovers?
They are both good. Depends on the R you can live with. The flat foil ones are strongly suggested for series XOs.

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Old 22nd July 2002, 02:18 PM   #3
Eric is offline Eric  United States
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Dave, I'm interested in your rationale as to why a foil crossover is better for series crossovers... I'm currently gathering parts for a small speaker system that calls for a series crossover.

Thanks, Eric
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Old 22nd July 2002, 03:19 PM   #4
AGGEMAM is offline AGGEMAM  Denmark
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Default Re: AlphaCore Copper Foil or Solen Hepta-litz ???

Quote:
Originally posted by bbaker6212
which would you use/prefer for speaker crossovers?
Neither, I use Jensen AirCore CopperFoil (or SilverFoil), but the foil inductors are extremely good for mid- and hi-range, and (as said above) for series crossovers.

Check this link for more info, especially note the dielectric material:

http://www.jensencapacitors.com/audi...s/aircore.html
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Old 22nd July 2002, 03:36 PM   #5
AGGEMAM is offline AGGEMAM  Denmark
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Quote:
Originally posted by Eric
Dave, I'm interested in your rationale as to why a foil crossover is better for series crossovers... I'm currently gathering parts for a small speaker system that calls for a series crossover.
Sorry if I answer this at least partly, foils have extremely AC/DC resistance resulting in less complecated XO calculation.
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Old 22nd July 2002, 04:50 PM   #6
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Quote:
Originally posted by Eric
I'm interested in your rationale as to why a foil crossover is better for series crossovers...
Low R. Any R in the inductor shelves the high pass at low frequencies so lower R means better tweeter protection.

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Old 22nd July 2002, 05:06 PM   #7
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Thanks for the explanation, Dave, this makes sense to me. I'm wondering if the recommendation of foil vs. "traditional" inductors for low R is brand-specific...

For example, I need two inductors 0.47 and 0.68mH, 12 ga. If you look at NorthcreekMusic.com, the resistance of these coils is .04 and .06 ohms, respectively. If you look at the Alpha-core foil inductors that Michael Percy stocks, the resistance of similar inductors is .11 and .13 ohms, respectively.

In this case, it appears that the more traditional coils from Northcreek have lower R... curious.
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Old 22nd July 2002, 06:05 PM   #8
AGGEMAM is offline AGGEMAM  Denmark
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Quote:
Originally posted by Eric
I'm wondering if the recommendation of foil vs. "traditional" inductors for low R is brand-specific...
Any value of less than a quater of an ohm should suffice for most modern tweeters. As I wrote earlier, foil inductors simply sound better as well especially if it is the mid- or hi-range we are talking about. Ah well ... what can I say but 'just try it'.

Have you checked the link I provided?
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Old 22nd July 2002, 06:26 PM   #9
Eric is offline Eric  United States
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AGGEMAN, yes, I have read the link you provided, thanks! I hadn't considered Jensen inductors, I'll have to poke around and learn a little more.

I suspected there was some "threshold" value, beyond which the R would not matter too much - I just didn't know what it was.

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Old 22nd July 2002, 07:05 PM   #10
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The foils are a lot better due to very low series resistance.
This means the crossover is not effected by the resistance of the coil.
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