I also have a couple of the same Vacuumschmelze cores laying around for quite some time. Also some of the russian cobalt ones that are so ubiquitous on ebay. So thanks for doing the groundwork . Latest one looks great, which size is that? If I remember right they go up in prize quite steeply.
You might want to crack open one of the Haufe and Pikatron toroids if you need more inspiration for winding patterns. I've never had one open, so I don't know if they are potted on the inside.
Its 45*25*15 mm al:88u. Price: 16 euro
Se datasheet in post 1
Aah, well done!
I'm currently working this very same route with a local talent here
5Hz at 10H indicates a driving impedance of ca. 300 Ohms - is this in the ballpark of what you're measuring it at?
If so, perhaps try measuring at 600 also, many dyna-mic's go toward here at higher frequencies - to get an idea of how interaction can be expected to play out..?
Yeas the low freq was calculated because my sound card rolls of earlier
The hi freq roll of was calculated with a 2k source in series
I hope you get sucess with the toroid IPT
Primary inductance was calculated and measured to 10H