DCR ratings of inductors - diyAudio
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Old 1st August 2007, 07:12 PM   #1
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Default 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?
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Old 1st August 2007, 11:00 PM   #2
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What size is the coil and what gauge wire is it?
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Old 2nd August 2007, 02:10 PM   #3
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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
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Old 2nd August 2007, 08:16 PM   #4
owdi is offline owdi  United States
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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
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Old 2nd August 2007, 08:35 PM   #5
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Thanks Dan.
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Old 2nd August 2007, 08:44 PM   #6
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Not only the efficiency, but the Q of the woofer will change (increase), making it sound just a little different.
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Old 4th August 2007, 05:25 PM   #7
peter_m is offline peter_m  Canada
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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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