Thiel Owners

Measured the received Jantzen Cross coil’s, the two 0.15mH measure both 0.152 but the two 0.72mH Jantzen wax coil’s measure 0.749mH and 0.750mH :(
This will lower the crossover for the woofer about 30hz (880hz vs 850hz), my first thought is to send them back and wait another month for new one’s but maybe one of you guys have other thoughts about this?
There is also the option that I unwind them to get 0.72mH, did that before in the past but never on a foil wax coil.

holco - unwinding is very common practice. I've never done a foil wax, but it sounds easier than a bonded coil.

I'm not following your math. 30 Hz seems like a big change. The complex effective resistance will be different with foil vs round. Can you measure the actual crosspoint change?

We always wound oversized and unwound to taste in R&D.

tomthiel,

The coil's are completely waxed, don't know how hard the layers stick to each other, if I demolish them I lose the guarantee to get new one's.

I suspect that the woofer is 4ohm, with a 6db crossover a 0.72mH coil cross at 880Hz, 0.75mH will cross at of 850Hz, so the loss will be about 30Hz.

Yes iff I want I can measure it with REW, but I don't want to complete the crossovers with the 0.75mH coil's.

Looking at my last Dirac Live measurement there seems to be a shoot over around 800hz > 1000hz, so the 30hz won't be a loss at that point.

[URL=https://picturepush.com/public/16097034][IMG]https://www1.picturepush.com/photo/a/16097034/1024/Thie...]

Holco - the woofer is 4 ohm, then incorporate any zobel network values for actual woofer impedance.

Perhaps talk to Jantzen about unwinding.