Helpdesk

Hello Hoang Nguyen Thanh,

thanks for the clarification. I now know what you mean and I do have a solution for it.

1. From the impedance response, take a "Curve Subrange" where you expect fb to be located.  (in my example, below this is between 40Hz and 100Hz
   
   
2. From this subrange, we can calcuate the frequency where the lowest value of the subrange is located. This is consequently fb

I've sent the FX-Control project file to your personal eMail address.

Best Regards,

Gregor

Hello Hoang Nguyen Thanh,

thanks for your message.

The "Resonance frequency" calculation item is able to calculate a resonance frequency out of any impedance response.  

When the impedance reponse is measured of the driver only, the calculated frequency is the responance frequency of that driver.

When the impedance response is measured of the loudspeaker enclosure, the calculated frequency is the resonance frequency of that loudspeaker.

The loudspeaker can have multiple resonance frequencies.  (Bass reflex, Woofer, Mid-range, Tweeter)

You can calculate an individual resonance frequency of an indiviudal component by limiting the frequency Scope in the calculation item.

I hope this helps.

Let me know if I can be of further assistance.

Best Regards,

Gregor

Gregor Schmidle

Product Manager

NTi Audio AG, Im alten Riet 102,
9494 Schaan, Liechtenstein, Europe

Hello Hoang Nguyen Thanh,

I am not particular familiar with the paramter fb.

However, from your description in your first message:

fb     ...    Resonance frequency with sound box

f0     ...    Resonance frequency of driver, with sound box

I would assume that these are the frequencies where f0 and fb are located like this:

So f0 would be the value calculated by the "Resonance frequency" calculation item with the input of the black curve,

and fb would be the value calculated by the "Resonance frequency" calculation item with the input of the yellow curve, 

Best Regards,

Gregor