Flux modulation

454Casull · 8th November 2008, 05:40 PM

We know that flux modulation is the name given to the change in permeability due to current through the voice coil (roughly speaking), and that there are (at least) two significant measurable effects - non-constant Le(i) and non-constant BL(i). The first comes from varying permeability of the iron through and around the voice coil. The second from the varying flux density (permeability -> field strength -> flux density) acting on the coil.

Can we not negate the effect of Le(i) by powering the driver with a current source (doesn't care about inductance) as opposed to a voltage source? Or is my understanding flawed?

Archmage · 9th November 2008, 05:15 AM

Current Driven Loudspeakers and Tranconductance Amplifiers

point me to some DIY designs and theory after you're done with that

Archmage · 9th November 2008, 08:36 AM

Ok...

Now I've noticed that YOU have posted in that thread years ago...

gedlee · 9th November 2008, 03:40 PM

Quote:

Originally posted by 454Casull
We know that flux modulation is the name given to the change in permeability due to current through the voice coil (roughly speaking), and that there are (at least) two significant measurable effects - non-constant Le(i) and non-constant BL(i). The first comes from varying permeability of the iron through and around the voice coil. The second from the varying flux density (permeability -> field strength -> flux density) acting on the coil.

Can we not negate the effect of Le(i) by powering the driver with a current source (doesn't care about inductance) as opposed to a voltage source? Or is my understanding flawed?

Yes, constant current does minimize the change of Le(i) but not as much the change of Bl(i).

8th November 2008, 05:40 PM	#1
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Flux modulation We know that flux modulation is the name given to the change in permeability due to current through the voice coil (roughly speaking), and that there are (at least) two significant measurable effects - non-constant Le(i) and non-constant BL(i). The first comes from varying permeability of the iron through and around the voice coil. The second from the varying flux density (permeability -> field strength -> flux density) acting on the coil. Can we not negate the effect of Le(i) by powering the driver with a current source (doesn't care about inductance) as opposed to a voltage source? Or is my understanding flawed?

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9th November 2008, 05:15 AM	#2
Archmage diyAudio Member Join Date: Jun 2005 Location: Irvine, CA	Current Driven Loudspeakers and Tranconductance Amplifiers point me to some DIY designs and theory after you're done with that

9th November 2008, 08:36 AM	#3
Archmage diyAudio Member Join Date: Jun 2005 Location: Irvine, CA	Ok... Now I've noticed that YOU have posted in that thread years ago...

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