CAPACITOR TEST - VERY SURPRISING RESULTS

[♔Chello]

SERIES CONNECTION = ZERO CROSSOVER EFFECT..?

I did an experiment - I connected the JBL horns in parallel, instead of in series as I had done.

Then something "strange" happened: The filter worked !
I made a mistake with the connection, because series connection changes the connection to the filter.

It can be safely stated that the filter now works, because the sound pressure was reduced when I halved the impedance, while the opposite should happen without a filter.

I have some of the best measuring equipment on the market for such things, which complies with the industry's strictest requirements according to the Thiele Small parameters - DATS.

So then all that remains is to check the impedance again, which I have now done by first recalibrating the DATS, performing an Impedance Sweep, and then a Measure Free-Air Parameters test:

   

My first measurement of 6.6 Ohm is confirmed with 6.572 Ohm

Fs is found to be 330.1 Hz, which also proves that I have repeatedly chosen a crossover frequency that is too low; such a filter will have no effect.

The red line for the impedance curve also suggests that the ideal crossover frequency is as high as 2 kHz or higher, as the curve has only minimal dropouts from there and upwards.

Some may wonder why I did not make this measurement in the first place - this is because I find great pleasure in working without the use of measuring equipment and making practical experiences, and finally making measurements that can explain my experiences.

I have now gone back to 1st order Butterworth, which only requires one capacitor, and use the Superior Z-Cap of 18 µF, which gives - 6dB at about 1300 Hz.

Human voices are still a bit too shrill - horns are extremely difficult to work with compared to all others.

If nothing else, brushes and the like are now even clearer, and I like that.