You need to change the tweeter filter. The SPL looks nice, but you can see that the tweeter alone is the cause of the low impedance above 2k .
thanks all for your contribution.
It is clear that the problem is the high cap value, but it is not possible for me to reach the same graph decreasing the cap and increasing the coil value.
Reducing cap and increasing the coil I can obtain this result.
It is clear that the problem is the high cap value, but it is not possible for me to reach the same graph decreasing the cap and increasing the coil value.
Reducing cap and increasing the coil I can obtain this result.
Try using an L-pad and a 2nd order configuration before and then use a target curve and let vituixcad calculate ideal values.
That looks like a nice tweeter. I can't imagine it dropping the impedance with a simple filter. Has anyone else had any luck A 3rd, or 4th order at 3k ought to be very easy.
If you want, post a zma, and frd file. Making guesses is getting nowhere.
If you want, post a zma, and frd file. Making guesses is getting nowhere.
Here they are. The zip file also contains mid and woofer as I am thinking to use it in a 3-way. The tweeter is basically a stac with a plastic faceplate (instead of the alu).
It’s a 4Ω tweeter… Of course the net result of your rather big series cap and smallish parallel coil plus the driver impedance is a low impedance at high frequencies. Since you keep thinking you don’t need to pad the tweeter down, this is what you get. Case of underestimating the difficulty of designing a good three way loudspeaker.
Oh, did you already notice? The 2π response of the woofer tips 87-88dB (from the data sheet). The series coil probably gives away a dB too. Will you correct for baffle step? Where does this lead you to?
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Your imp file shows 3,5 ohm ca at tweeter.
This xover is 4 ohm.
Edit: over 5 ohm from 5K with a 1,5 ohm resistor at the end.
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Thanks a lot for the trick, this make the difference.
I'm not able to read the values of coil and cap in parallel, but doing some try I reached this result. The minimum impedence is 3,8ohm.