I’m assuming the output impedance of line level products are ~10k ?
We do not know the input impedance of the FR10/12s ?
WRT the impedance matching transformer…we need to know these figures.
1 = gnd/shield, 2 = +, 3 = - , for an xlr(info only)
In addition, the turns ratio is important….assuming 2:1…or if the trans is a 1:1…connect the unbalanced signal(T) to the center tap…
This sound about right?
I need a potentiometer and a signal generator to measure the input impedance of the FR10/12s….can’t find my decade box.