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Open baffle step compensation on fullrange adds distortion
Open baffle step compensation on fullrange adds distortion
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Old 2nd July 2020, 09:16 AM   #11
Juhazi is offline Juhazi  Finland
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Yes that type of coil is not suitable for crossovers.

Anyway the real problem to my understanding is that a small driver is asked to produce low frequencies as dipole.

Baffle step (or actually loss) compensation with a serial coil is 1st order lowpass by nature and it will attenuate mid and high frequency (sensitivity) When the driver is asked to put out "normal" spl fullrange , it is driver to extreme excursion in bass-low mid very easily.

This is main reason why dipole speakers must be at least 2-way with large bass driver(s)

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Last edited by Juhazi; 2nd July 2020 at 09:39 AM.
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Old 2nd July 2020, 02:26 PM   #12
flo777 is offline flo777  Canada
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Thanks perceval, for confirming that these inductors are in fact problematic.
And thanks Juhazi, for bringing up the issue of driver excursion.
The distortion I heard was very similar to voice coil rubbing.

I hope that this won't be the case with good inductors, especially since the drivers are 1 m away from me and I won't be listening at loud volumes.

These drivers were also used in OB using a similar crossover (10 ohm and 2mH, instead of 12 ohm and 3.3mH)
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For 4 ohm drivers, I found that this 1st order low pass is 193 Hz for 3.3mH inductor and 318 Hz for 2mH inductor.
Maybe the high/mid attenuation is more due to the 12 ohm resistor instead of 10 ohm, but can it make such a difference to create excursion issues?
 

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