The XSM15K/10K and XSM15K/15K show as being in stock. Is it possible to grab one of each and measure them? This would be very useful information that could added to the on-line specifications. It would also go a long way in determining which one is best suited for my project.
I already see the XSM10K/10K has a specification of 25H. That's not quite enough for what I need, so would really like to know about the XSM15K/10K and XSM15K/15K.
I have used edcor SE OPTs and am quite pleased with them. The XSM line matching transformers look like a real possibility for a para-feed interstage transformer/phase splitter but without some idea of primary inductance it is very hard to know what the real response will be or to design the surrounding circuitry. Obviously the inductance will largely determine the in circuit bass response and will generate a resonance with the para-feed coupling capacitor.