Cracked Inductor Core?

[Spuddy]

The Jantzen crossover parts I've been waiting almost a month for finally came in from Europe today, and what do you know, ALL of my non-ferrite core inductor coils are cracked on one side somehow (I say somehow because it couldn't have happed during shipping with the way everything was packaged)

They all have a crack like this:





Is this going to make a big difference in sound, or is it not a big deal? If it's a trivial thing I'd like to just go ahead and make these speakers already (been waiting a while for this stuff to come..) but of course I can't just start soldering things together if the sound will be affected. Is this just a visual thing, or should I get in touch with EuropeAudio.com and sit out another month while they sluggishly send me some replacements?


Thanks for the help

[Mooly]

Thats a good question...

If it were a small ferrite core used for RF etc then yes, the characteristics would change.

At audio and the low frequencies involved and the large tolerances, and the sheer size of the thing... well, I honestly don't know how detrimental this is. My feeling is probably not very.

[Shaun]

if it is non-ferrite, what is it actually made of?

[Spuddy]

Honestly, I don't know what the core is, can't seem to find out either..?

This is one of them, though for some reason the one in the pic doesn't have the 1/4" of extra metal on the end (where the crack is on mine) JANTZEN-5387 - Jantzen Wire non-ferrite cored coil 10,000mH 0,390Ohm 1,40mm - Europe Audio

Hopefully it really isn't a problem as Mooly said- I can attest to the size of the coil and outside position of the crack seeming insignificant, just want to make sure it's ok since I'm new to crossovers

Thanks guys!

[Mooly]

Daft question but is it magnetic ? or is the core just a non magnetic former ?

Without seeing and handling it's hard to tell from a piccy.

[jcx]

search suggests P core is "ferrous powder" material - why they wouldn't just say Sendust if thats what they're using?

the implicit large "air gap" of the bobbin means the cracks shouldn't have any real effect on the inductor value

presumably the "ferrous powder" has insulated particles to reduce Eddy current loss - again the barely visible cracks wouldn't change loss behavior

[AllenB]

Wow. These coated, non-oxidised ferric particles remind me of a kind of cassette I used to use making tapes for my car.

My biggest concern would be that one day, the cracked portion would break off, but then I rearrange crossovers from time to time. I'd be disappointed to get somewhere and then lose it to something like that. I'd rather stabilse it now by either strengthening it, or breaking it off for good.

[Starre]

Dropped to the floor before delivery? Get it replaced!

[AllenB]

It's very possible Starre. I happened to be thinking about damage during delivery due to insufficient packaging. I realise that Spuddy said they appeared to be packed well, but it's worth considering that this stuff is not strong, and international shipping is not always polite.

[David Gatti]

Since the possible effects are unknown I'd be requesting a replacement.