CAPACITOR TEST - VERY SURPRISING RESULTS

[♔Chello]

I have now tested with APO EQ, and found that a strong reduction of -8dB at 900 and 950 Hz greatly reduced the problem of shrill human voices.
There was also an area around 1800 Hz with half as much dropout, which I attenuated by -4dB.

I first tried recommended ranges around 4000 Hz, but this affected other instruments adversely.

When I studied my own measurement with DATS, there is a strong dropout in the impedance around 900-950 Hz, which results in this range being reproduced several dB too loud.

   

It is nice when theory and practice agree..!

Now I know more precisely where the crossover frequency will work best, and I guessed well at 1300 Hz (or higher; 2-3000 Hz), but need an additional coil to increase the reduction to -12dB.

A new value for the capacitor must also be calculated.

A Linkwitz-Riley filter is probably best.

Then I avoid the actual problem range(s), which is 900-950 and 1800 Hz.