Wierd tweeter response?!

[sobazz]

Uhhh... haven't been playing around with imaginary numbers for a couple of years... 😉

Thank you for the explanation. I'm having some troubles. The measured free air resonce of the Vifa drivers is 74hz, but is supposed to be - according to the data sheet - 60hz. When measuring in the ported box the Fb is 57hz and not approx 70hz as simulated. It puzzles me...

The tweeter measures well.

EDIT: The precision problems I had yesterday and which I thought was the reason for the difference between measured data and Vifa numbers has been cured. I've put together a jig with better contacts and cables. Now inductance is measured properly and the numbers above is verified.

 

[Svante]

Uhhh... haven't been playing around with imaginary numbers for a couple of years... 😉

Thank you for the explanation. I'm having some troubles. The measured free air resonce of the Vifa drivers is 74hz, but is supposed to be - according to the data sheet - 60hz. When measuring in the ported box the Fb is 57hz and not approx 70hz as simulated. It puzzles me...

Would you have impedance curves to show? I've had a bunch of peerless drives that was supposed to be 35 Hz, but they was ~50 Hz if I remember correctly. So, it isn't impossible.