Field coil speakers - pros and cons

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DonMcG

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Field coil speakers - pros and cons
« on: 19 Jan 2023, 02:11 pm »
Hi,

Danny what are the pros and cons of field coil speakers?

Thanks in advance,

Don

Danny Richie

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Re: Field coil speakers - pros and cons
« Reply #1 on: 20 Jan 2023, 10:35 pm »
The advantage is having adjustable electrical parameters on the fly. In practice though they are typically left in a specific setting once optimal for the application is found. So the adjustable feature is not that big of a deal. Other than that they have the same issues and considerations as any other driver. The con is that they cost is much higher.

kd4ylq

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Re: Field coil speakers - pros and cons
« Reply #2 on: 20 Jan 2023, 11:01 pm »
On the con side, you need a quiet, stable DC power supply for each coil. So that adds complexity, weight, expense and reduced reliability. They were all the rage a very long time ago (many decades), before high flux, consistent permanent magnets were cheap and readily available. Can't understand why they are coming back really.