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Are Hammond reactor good for woofer crossover?
Are Hammond reactor good for woofer crossover?
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Old 19th January 2021, 03:27 PM   #1
ygg-it is offline ygg-it  Italy
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Default Are Hammond reactor good for woofer crossover?

Hello I need an inductor of about 30mH in series to my 8 ohm woofer.

Max speaker power is 45W/90W. Amplifier no more than 40 watt RMS output.

Are these inductors ok for a crossover?

195P5
Hammond Manufacturing
FIXED IND 30MH 5A 230 MOHM CHASS

195P5 - Hammond Mfg.
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Old 19th January 2021, 08:28 PM   #2
wolf_teeth is offline wolf_teeth  United States
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Not really the right part, and they have pretty high DCR.
Wolf
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Old 19th January 2021, 08:35 PM   #3
AllenB is offline AllenB  Australia
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Are Hammond reactor good for woofer crossover?
I might guess a reactor could produce some distortion. I wouldn't use it unless I had it and could test it first.
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Old 20th January 2021, 07:10 AM   #4
ygg-it is offline ygg-it  Italy
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Quote:
Originally Posted by wolf_teeth View Post
Not really the right part, and they have pretty high DCR.
Wolf
Hey Wolf 0,23 ohm for a 30mH indictor, don't think is so high.
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Old 20th January 2021, 07:11 AM   #5
ygg-it is offline ygg-it  Italy
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Quote:
Originally Posted by AllenB View Post
I might guess a reactor could produce some distortion. I wouldn't use it unless I had it and could test it first.
Which is the difference between this reactor and an inductor?
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Old 20th January 2021, 07:46 AM   #6
markbakk is offline markbakk  Netherlands
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Seems a laminated steel E-core coil to me. If it's wound properly I think it will do audio just fine. Though I know of one (1) old design with a 30mH series inductor, I'm really curious how you got to this crossover setup...
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Old 20th January 2021, 10:07 AM   #7
ygg-it is offline ygg-it  Italy
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30mH is in series with a woofer.
This cell (woofer+inductor) is in parallel to another identical woofer to enhance 40-100Hz octaves.
Both work in two separate vented volumes
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Old 20th January 2021, 10:27 AM   #8
celef is offline celef
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I do not think .23 ohm is that much either

I guess this large coil can have some microphony issues if not constructed well or baked, so it is better to keep it outside the speaker box and far away from the listening position
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Old 20th January 2021, 10:42 AM   #9
ErikdeBest is offline ErikdeBest  Switzerland
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maybe you know it, but this unit is meant for filtering a DC power supply. For that it needs an airgap. Due to the airgap it needs a much bigger core, Due to bigger core it needs more wire, therefore higher DCR.

You do not need to handle DC current, so you could go for a much smaller core, lighter and lower DCR. I am not saying these smaller cores will be cheaper though

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.
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Old 20th January 2021, 01:57 PM   #10
markbakk is offline markbakk  Netherlands
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Try this one or this one.
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