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Multi-Way Conventional loudspeakers with crossovers

Inductor coil distance from loudspeaker magnet
Inductor coil distance from loudspeaker magnet
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Old 14th January 2018, 07:56 PM   #1
HiFiNutNut is offline HiFiNutNut  Australia
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Default Inductor coil distance from loudspeaker magnet

4 inductors of various sizes on the passive XO board are placed as close as 10cm to the magnet of the 12' Peerless XLS driver.

Would that distance from the magnet cause problems to the inductors? How far is safe?
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Old 14th January 2018, 10:15 PM   #2
Tweet is offline Tweet  Australia
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Quote:
Originally Posted by HiFiNutNut View Post
4 inductors of various sizes on the passive XO board are placed as close as 10cm to the magnet of the 12' Peerless XLS driver.

Would that distance from the magnet cause problems to the inductors? How far is safe?
If the inductors are air-cored there will be little to no effect on the inductance, but if the inductors are iron cored there is likely to be some change in the inductance of the inductors due to the induced magnetism from the magnet into the cores.
Whether this will make a noticeable difference audio wise can only be tested by removing the crossover some distance from the speaker's magnet.

C.M
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Old 14th January 2018, 10:44 PM   #3
HiFiNutNut is offline HiFiNutNut  Australia
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All inductors I use are air-cored inductors. So do you mean air-cored inductors don't generate magnetic field?
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Old 15th January 2018, 12:22 AM   #4
boswald is offline boswald  United States
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Inductor coil distance from loudspeaker magnet
They do, but more compact. In any case we're talking <2% vs <6%(just did a little test). So I wouldn't sweat it.
Now, if it actually was a 12 ft woofer......
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Old 15th January 2018, 04:27 AM   #5
AllenB is offline AllenB  Australia
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Your larger issue will be how the driver motor shorts the inductor flux (due to the motor's permeability) and changes its value, rather than the driver flux itself.
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Old 15th January 2018, 08:03 PM   #6
HiFiNutNut is offline HiFiNutNut  Australia
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If the change to the flux / inductor value is constant then there is no problem, as I can adjust the inductor value.

If the change to the flux / inductor value is variant with signal, then there is a problem, because distortion is introduced.
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Old 16th January 2018, 04:32 AM   #7
AllenB is offline AllenB  Australia
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I don't know who's studied this, I haven't, but the possibilities are straightforward I think. The inductor flux could modulate the motor. The motor could saturate if it isn't already. I know I've had inductors close to magnets before with little to report but I don't choose to do it.

You could use some shielding if you have no choice.
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