Tweeter Zobel, or more accurately, RC network.

[Tyimo]

If the crosspoint is two octaves away from the resonace frequecy of the tweeter , will RLC Serial Resonant Circuit still be apparently useful?

This old question not answered yet.
Can somebody answer it?
Greets: Tyimo

 

[soongsc]

It depends on how picky you get and the quality of the drivers. You can flatten the impedance of the drivers individually, but chances are you have to do something again for the total crossover. Focusing on the total crossover reduces interaction between the amp and the speaker.

 

[Tyimo]

Thanks!

 

[leesee]

I have used Zobels on tweeters before, usually around 2uF or lower, using them did seem to make a cheap tweeter better, but Rod Elliot or perhaps LDC said it make the load on the amplifier better, remembering that this load should be at least flat to 2 octaves above highest reproduced, so if tweeter goes to 25k then the load should be as flat as possible to 100k.

This is where you need to experiment, a small cap and 5W resistor won't set you back more than a dollar, and I always set my Zobels on the back of the driver anyway so very easy to do with-out pulling the XO out

I have a crossover circuit (see attached) there is a RC network (2uF capacitor & 10 ohm resistor) in series to the positive path to the tweeter, may i know what is that for? is there a formular to that circuit to figure out the values for the capacitor and resistor? if i replace it with a 3uF capacitor what value of resistor should i put to achieve the the same effect?

 

[wolf_teeth]

That is a "parallel contour" to lend a rise to a drooping top octave response. The network for this thread consists of a cap in series with a resistor, placed across the tweeter. They literally perform the opposite task from each other, yours and this thread's circuits.