DCR ratings of inductors

Wamba-lam · 1st August 2007, 07:12 PM

I am refurbishing a crossover that i have a schematic for. On this schematic the DCR for (inductor) L1 is given as .36 ohms. The best replacement i have found is rated at .7 ohms. This is a 2nd order 2 way crossover and L1 is on the woofer side of the network. Will this change in DCR significantly move the crossover frequency or cause other unwanted problems?

Cal Weldon · 1st August 2007, 11:00 PM

What size is the coil and what gauge wire is it?

Wamba-lam · 2nd August 2007, 02:10 PM

The ones i'm looking at are:

http://www.partsexpress.com/pe/pshow...TOKEN=84747979

http://www.partsexpress.com/pe/pshow...TOKEN=84747979

I like this one but i dont want to wait 3 weeks for it to be in stock:

http://www.partsexpress.com/pe/pshow...TOKEN=84747979

the ideal is :

2.0 mH
57 x 9.5 x 10 mm
Icore , 0.36 ohm DCR 19 AWG

owdi · 2nd August 2007, 08:16 PM

An inductor with higher DCR will lower the efficiency of the woofer. Going from .36 to .7 ohms will only lower it by about half a db, but it will be over a broad range, so you may notice a shift in tonal balance.

Try zalytron.com, they have an 18 awg Erse Super Q iron core inductor for only $7.41, with a DCR of .217. You have to pay with paypal, and shipping will cost a little more than PE.

Zalytron also has the a 14 awg 2.00mh air coil inductor, with a DCR of .306. Price is $14.77

Dan

Wamba-lam · 2nd August 2007, 08:35 PM

Thanks Dan.

richie00boy · 2nd August 2007, 08:44 PM

Not only the efficiency, but the Q of the woofer will change (increase), making it sound just a little different.

peter_m · 4th August 2007, 05:25 PM

What would happen if I replaced an inductor with a lower DCR?

http://zaphaudio.com/audio-speaker17-crossover.gif

In Zaph's L18 design I plan to build my own coil for the L0 2.2mH to save a few bucks. It's not that hard really. According to online inductor calculators, I can get and even lower DCR at about 0.18ohm. Will that be detrimental to the design? Should it be the 0.30 ohm exactly as he specified?

Peter

1st August 2007, 07:12 PM	#1
Wamba-lam diyAudio Member Join Date: Jul 2007	DCR ratings of inductors I am refurbishing a crossover that i have a schematic for. On this schematic the DCR for (inductor) L1 is given as .36 ohms. The best replacement i have found is rated at .7 ohms. This is a 2nd order 2 way crossover and L1 is on the woofer side of the network. Will this change in DCR significantly move the crossover frequency or cause other unwanted problems?

1st August 2007, 11:00 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	What size is the coil and what gauge wire is it? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

2nd August 2007, 08:44 PM	#6
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Not only the efficiency, but the Q of the woofer will change (increase), making it sound just a little different. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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2nd August 2007, 02:10 PM	#3
Wamba-lam diyAudio Member Join Date: Jul 2007	The ones i'm looking at are: http://www.partsexpress.com/pe/pshow...TOKEN=84747979 http://www.partsexpress.com/pe/pshow...TOKEN=84747979 I like this one but i dont want to wait 3 weeks for it to be in stock: http://www.partsexpress.com/pe/pshow...TOKEN=84747979 the ideal is : 2.0 mH 57 x 9.5 x 10 mm Icore , 0.36 ohm DCR 19 AWG

2nd August 2007, 08:16 PM	#4
owdi diyAudio Member Join Date: Sep 2003 Location: Bellevue, WA	An inductor with higher DCR will lower the efficiency of the woofer. Going from .36 to .7 ohms will only lower it by about half a db, but it will be over a broad range, so you may notice a shift in tonal balance. Try zalytron.com, they have an 18 awg Erse Super Q iron core inductor for only $7.41, with a DCR of .217. You have to pay with paypal, and shipping will cost a little more than PE. Zalytron also has the a 14 awg 2.00mh air coil inductor, with a DCR of .306. Price is $14.77 Dan

2nd August 2007, 08:35 PM	#5
Wamba-lam diyAudio Member Join Date: Jul 2007	Thanks Dan.

4th August 2007, 05:25 PM	#7
peter_m diyAudio Member Join Date: May 2007	What would happen if I replaced an inductor with a lower DCR? http://zaphaudio.com/audio-speaker17-crossover.gif In Zaph's L18 design I plan to build my own coil for the L0 2.2mH to save a few bucks. It's not that hard really. According to online inductor calculators, I can get and even lower DCR at about 0.18ohm. Will that be detrimental to the design? Should it be the 0.30 ohm exactly as he specified? Peter

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