Crossover frequency

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Kamranbits

Kamranbits

Member
Joined 2023
#1
Is this correct ?


(using
Capacitance = 2.2μF
Tweeter Impedance = 6 ohms

Crossover frequency would be approximately 12.12 kHz in this speaker setup.)



(with a 3.3μF capacitor and a 4-ohm tweeter, the crossover frequency would be approximately 12.12 kHz in this speaker setup.)
 
#2
Yeah, the acoustical -3 dB point would be at 12120 Hz, but only if the raw frequency and impedance response (before applying the crossover filter) of the tweeter is completely flat . Which is not the case of approx. the 99,9% of realworld drivers. That's one reason why online crossover calculators are almost useless.
 
#3
The crossover frequency calculators are all wrong as they assume that the drivers have flat frequency response, and flat impedance. Real world drivers have FR and impedance that vary with frequency. Crossover components should be simulated with a simulator, in order to take correctly into account real FR and impedance.

Ralf
 
#4
I played around with this area recently. I used an Australian sites factors rather than calculators that are built into the simulator I currently use. Results were way off until I added corrections, mainly to flatten the speakers impedance - mainly a simple rc network. The calculated version of that needed adjustment. That produced a closer result. The speaker also had a cone break up problem. More additions to try to handle that still using the factored xover values improved things further but still not truly correct. These factors also seem to favour low inductance values - too low in IMHO. There are several sites around that approach things this way rather than providing classical formulae.

The built in calculators I mentioned - same problems but I didn't try adding speaker corrections.
 
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