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Are Hammond reactor good for woofer crossover?
Are Hammond reactor good for woofer crossover?
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Old 20th January 2021, 02:19 PM   #11
Lojzek is offline Lojzek  Croatia
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Give Erse Audio a call and ask a quote on a Super Q 16awg 30mH or get some of a lower value, then wind additional magnet wire.
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Old 20th January 2021, 03:53 PM   #12
ygg-it is offline ygg-it  Italy
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Quote:
Originally Posted by ErikdeBest View Post
Another thing. The specification of 30mH is with the 5A DC current. Besides tolerances that may change this value, if there is no DC current the actual inductance will probably be higher.
This is scaring me!

So which the relations, which value should I order?
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Old 20th January 2021, 07:03 PM   #13
wolf_teeth is offline wolf_teeth  United States
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Even if dcr is low enough, sorry about my memory there, it's not meant for the application of xover.
Goals are very different. Yeah, get a superQ and wind up.

Wolf
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Old 20th January 2021, 07:21 PM   #14
markbakk is offline markbakk  Netherlands
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Quote:
Originally Posted by ygg-it View Post
So which the relations, which value should I order?
Wonít post the links again, what is your hesitation about? The E96 will do fine, like they did about 30 years ago already.
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Old 20th January 2021, 07:50 PM   #15
ygg-it is offline ygg-it  Italy
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If we check this:

Monacor LSI-15T Tranformer Coil 15mH

it has exacltly the same construction of the Hammond (EI transformer)

Also this has the same construction:

MUNDORF N300 Zero Ohm Self Coil 6.8mH - Audiophonics


So I still don't understand why the hammond, or similar reactor/ transformer coils, would not work good in a crossover, and why should change its inductance in AC.
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Old 20th January 2021, 08:33 PM   #16
steveu is offline steveu  United States
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1. Any kind of core vs air core is going to create some distortion.
2. A 40 Hz crossover must be for a sub which needs a lot more power and gain than the rest of the audio so a separate amp is the best plan and allows you to use an electronic crossover without the issues of a passive XO.
3. A direct connection between amp and speaker is much better for buffering factor.

You don't necessarily need a 40Hz high-pass for the rest of the system since most speakers are done below 40 Hz. The only reason might be to get more mid band etc power in the other channels.

Last edited by steveu; 20th January 2021 at 08:40 PM.
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Old 20th January 2021, 08:43 PM   #17
markbakk is offline markbakk  Netherlands
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I really suspect the Hammond coil to be just fine, as it obviously uses the E-core that compares well with the E-96 or E-130 from Intertechnik. There won’t be no air gap, 99 per cent sure. But the jump to 100 per cent will demand ordering one and measure it. I don’t need such a coil though. And even if I would, I’d get the E-96 from IT. I know that one and it’s good.
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Old 21st January 2021, 05:55 AM   #18
celef is offline celef
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Quote:
Originally Posted by ygg-it View Post
Sure, you can put two in series and get 30mh and still have a low serie resistance

But the ones i have tried had serious trouble with microphony
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Old 21st January 2021, 07:02 AM   #19
ErikdeBest is offline ErikdeBest  Switzerland
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Quote:
Originally Posted by markbakk View Post
I really suspect the Hammond coil to be just fine, as it obviously uses the E-core that compares well with the E-96 or E-130 from Intertechnik. There wonít be no air gap, 99 per cent sure. But the jump to 100 per cent will demand ordering one and measure it. I donít need such a coil though. And even if I would, Iíd get the E-96 from IT. I know that one and itís good.
You mean the Hammond has no gap? Here is the datasheet, it is there (and there is a +-15% tolerance). https://www.hammfg.com/files/parts/pdf/195P5.pdf

My audio experience is mostly into tube amplifiers and from them I know the Hammonds, used a lot in smoothing the DC supplies. This unit would do nice as a smoothing coil for a nice SS class AB amplifier.
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Old 21st January 2021, 07:12 AM   #20
AllenB is offline AllenB  Australia
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Are Hammond reactor good for woofer crossover?
Quote:
Originally Posted by ygg-it View Post
Which is the difference between this reactor and an inductor?
A reactor is often used in a current control situation, eg current limiting, or as a ballast. They are sometimes seen in audio amplifier power supplies. In that application they are known to have an inductance that varies with current. Attached is an example which is rated to give a fivefold difference in inductance over a tenfold variation in current.
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File Type: jpg 20200207_222747.jpg (292.2 KB, 54 views)
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