Air core coil for the wd25tex coil anyone. - World-Designs-Forum

VantheMan · #1 19th March 2021, 11:47 AM

Has anyone, by any chance ever tried a 0.76H air core coil for the Seas mid bass driver on their wd25tex speakers instead of the ferrite cored one in the original kit ? How did it go ? If no one has, do any of the more learned here think it might be worth trying ?

Richard · #2 19th March 2021, 03:24 PM

Hi Van,
Ideally you'd keep inductance and DCR the same so an air cored inductor would have to be bigger than a ferrite cored inductor for the same inductance and resistance.
In this case the supplied ferrite coil is only 0.2R DCR and, as long as the core isn't saturating, I wouldn't expect much/any difference in sound going to an air core.
I haven't looked but it may be that you might not even be able to get 0.76mH 0.2DCR in an air core but you could perhaps wind your own.

VantheMan · #3 19th March 2021, 03:55 PM

Hi Richard, there are Jansen wax foil coils with exactly the same values as the original ferrites: 0.76H and 0.2 DCR. Not too large for my external xovers. Guess I’m after a bit more snap and thought I might try.

Richard · #4 20th March 2021, 08:43 AM

Maybe give them a go then Van but check the power rating so they don't overheat and melt the wax in your lovely climate. Perhaps the 13 gauge enamelled wire version would be safer.

VantheMan · #5 20th March 2021, 10:03 AM

Lovely climate ? 9 months a year maybe. I’ll swap mine for yours June - August anyday.

Richard · #6 22nd March 2021, 10:10 AM

Hi Van, we only went once at Christmas - surreal lounging by the pool on Christmas day - and Feb and Oct half terms with the kids when they were young. I take it the summer is a bit warm then!

I had a look at Hifi Collective site and see this waxcoil 0.75mH 0.16DCR,
https://www.hificollective.co.uk/con...mm-width-12awg
and this air core enamelled wire 0.76mH 0.17DCR,
https://www.hificollective.co.uk/cat...wire-coil.html
I'm not sure if they'd fit or you had others in mind. There's no real indication about power handling of the coils that I can see.
(Probably the power rating isn't the issue with the wire gauge but it seems you'll need to use heavier gauge to keep similar DCR as the wire will be longer for similar inductance.)