Are Hammond reactor good for woofer crossover?

ygg-it · 19th January 2021, 03:27 PM

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.

wolf_teeth · 19th January 2021, 08:28 PM

Not really the right part, and they have pretty high DCR.
Wolf

AllenB · 19th January 2021, 08:35 PM

I might guess a reactor could produce some distortion. I wouldn't use it unless I had it and could test it first.

ygg-it · 20th January 2021, 07:10 AM

Quote:

Originally Posted by wolf_teeth

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.

ygg-it · 20th January 2021, 07:11 AM

Quote:

Originally Posted by AllenB

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?

markbakk · 20th January 2021, 07:46 AM

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...

ygg-it · 20th January 2021, 10:07 AM

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

celef · 20th January 2021, 10:27 AM

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

ErikdeBest · 20th January 2021, 10:42 AM

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.

markbakk · 20th January 2021, 01:57 PM

Try this one or this one.

19th January 2021, 03:27 PM	#1
ygg-it diyAudio Member Join Date: Feb 2008 Location: ITALY	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.

19th January 2021, 08:28 PM	#2
wolf_teeth diyAudio Member Join Date: Mar 2006 Location: Indiana	Not really the right part, and they have pretty high DCR. Wolf __________________ Photobucket picture pages/Writeups,thoughts,blogs/InDIYana event website

20th January 2021, 10:42 AM	#9
ErikdeBest diyAudio Member Join Date: Mar 2003 Location: Zürich	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. __________________ my surname is indeed 'de Best': neither misspelling nor snobbism! Ask SY!

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19th January 2021, 08:35 PM	#3
AllenB diyAudio Moderator Join Date: Oct 2008	I might guess a reactor could produce some distortion. I wouldn't use it unless I had it and could test it first.

20th January 2021, 07:46 AM	#6
markbakk diyAudio Member Join Date: Dec 2011 Location: Arnhem, NL	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...

20th January 2021, 10:07 AM	#7
ygg-it diyAudio Member Join Date: Feb 2008 Location: ITALY	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

20th January 2021, 10:27 AM	#8
celef diyAudio Member Join Date: Nov 2012	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

20th January 2021, 01:57 PM	#10
markbakk diyAudio Member Join Date: Dec 2011 Location: Arnhem, NL	Try this one or this one.