Hi all!

Very interesting speaker. Heaven't build it, unfortunately it's simply too large for my very small listening room. But there is one thing with this speaker that puzzles me...

If you have a look at the attached picture of the crossover and the frequency response for different series resistor values, you'll see that the crossover frequency doesn't change very much with these different series resistor values. Now, from what I've learned, the value of a series capacitor depends on both, the desired crossover point AND the resistance after the cap. In this case the cap is always the same 3,3uF, but the series resistor and the tweeter (6 Ohm nominal) make completely different resistor values, from 12,8 ohm (with the 6,8R) up to 21,0 ohm (with the 15R). So, the 3,3uF cap "sees" resistor values from 12,8 to 21 ohms without any obvious changes in the crossover frequency.

How is that possible?

Thanks a lot!

Martin