Capacitor for Super Tweeter Crossover

[chrisng]

The impedance and resistance values are just taken from the data sheet.
Mitch

What is the DC resistance measured with an ohmmeter?
If it is indeed a 16 ohm driver, I would guess that its DC resistance is about 1 to 3 ohms lower than its nominal impedance.

 

[AllenB]

That's fine, you tend to disagree a lot.

If my words don't suit, then I apologise.. but I'd only need to measure impedance one other way to prove my point. Is that what you're arguing against?

 

[chrisng]

For future reference should I be using the nominal impedance or the DC resistance in the calculation?

https://www.claredot.net/en/sec-Sound/high-pass-cross-over-6dB.php

 

[Lees]

Nominal Impedance	/K = 7 OHM /G = 16 OHM
D.C. Resistance	/K = 6 OHM /G = 23 OHM

Taken from data sheet. Not sure what it really means! My tweeter is the 16 ohms variety.
Mitch

 

[Lees]

Chrisng. Thank you for the calculator link. It shows that the 0.8uF value is about right - that is encouraging at least!
Mitch

 

[adason]

Is there fr response, on axis and off axis, available?

 

[adason]

What does you multimeter reads?

 

[Lees]

What is the DC resistance measured with an ohmmeter?

22.7ohms. Measured with my ‘not very expensive’ meter. But what does that tell us? Is that the value I should be using in the capacitor calculation? I know it is only a starting point, but….
Mitch

 

[adason]

I would stick to 16 ohm, ac specified by manufacturer. Ignore dc.

 

[Lees]

Will do. Thanks

 

[chrisng]

22.7ohms. Measured with my ‘not very expensive’ meter.

The question remains, is the impedance of this driver at 12.5kHz lower than its DC resistance of 23ohm?
If the answer is no, does this mean that with a 0.8uF capacitor the crossover point will be well below 12.5kHz?
Maybe 8-9kHz?