Does the DCR of parallel inductors matter?

Mos Fetish · 3rd February 2004, 03:21 AM

Some suggest using lower quality/priced components in the non-signal critical areas of crossovers such as paralleled components that are effectively only shunting to ground.

But does the DCR of coils matter here as much as it does in the signal path?

Mos

roddyama · 3rd February 2004, 03:47 AM

So the question is whether the distortion created by a parallel component that shunts to ground can affect the signal to the output, in this case a speaker.

If you assume the distortion is in fact generated in a “lower quality” component, that distortion will be manifest in a voltage other than ideal (different from the signal). Since the component is shunting from the signal path to ground, it has at least one node (connection) in the signal path. The distortion generated by the component has to exist at this signal path node. So the answer has to be yes, this component, even though it is not in the signal path, will affect the actual signal.

So the real question should be will the “high quality” component generate less distortion than the lesser quality component, in the signal path or not?

Mos Fetish · 3rd February 2004, 04:11 AM

What I'm asking is not related to distortion, it's related to the resistive action of a parallel component. Unless you count resistance as distortion, that is.

So, explicitly: does a higher resistance coil in parallel with the signal path impart any more resistance to the signal path than a lower resistance coil would?

Mos

roddyama · 3rd February 2004, 04:26 AM

Quote:

Originally posted by Mos Fetish
So, explicitly: does a higher resistance coil in parallel with the signal path impart any more resistance to the signal path than a lower resistance coil would?

Mos

The resistance of the signal path is what it is regardless of any parallel resistances. The overall signal path, including parallel resistances has less total resistance when the parallel coil has a lower DCR.

rabbitz · 3rd February 2004, 10:43 AM

Hi Mos

I read somewhere that the DCR of the inductor should be less than 10% of the voice coil DCR.

So for a driver with a DCR of 5.7ohm the inductor should have a DCR less than 0.57ohm.

Apparently so it has little affect on the driver Q. Thiele states that 5% will not affect driver Q.

Hope this helps.

3rd February 2004, 03:21 AM	#1
Mos Fetish diyAudio Member Join Date: Feb 2003 Location: New Zealand	Does the DCR of parallel inductors matter? Some suggest using lower quality/priced components in the non-signal critical areas of crossovers such as paralleled components that are effectively only shunting to ground. But does the DCR of coils matter here as much as it does in the signal path? Mos

3rd February 2004, 03:47 AM	#2
roddyama diyAudio Moderator Emeritus Join Date: Jan 2002 Location: Michigan	So the question is whether the distortion created by a parallel component that shunts to ground can affect the signal to the output, in this case a speaker. If you assume the distortion is in fact generated in a “lower quality” component, that distortion will be manifest in a voltage other than ideal (different from the signal). Since the component is shunting from the signal path to ground, it has at least one node (connection) in the signal path. The distortion generated by the component has to exist at this signal path node. So the answer has to be yes, this component, even though it is not in the signal path, will affect the actual signal. So the real question should be will the “high quality” component generate less distortion than the lesser quality component, in the signal path or not? __________________ Rodd Yamashita

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3rd February 2004, 04:11 AM	#3
Mos Fetish diyAudio Member Join Date: Feb 2003 Location: New Zealand	What I'm asking is not related to distortion, it's related to the resistive action of a parallel component. Unless you count resistance as distortion, that is. So, explicitly: does a higher resistance coil in parallel with the signal path impart any more resistance to the signal path than a lower resistance coil would? Mos

3rd February 2004, 10:43 AM	#5
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	Hi Mos I read somewhere that the DCR of the inductor should be less than 10% of the voice coil DCR. So for a driver with a DCR of 5.7ohm the inductor should have a DCR less than 0.57ohm. Apparently so it has little affect on the driver Q. Thiele states that 5% will not affect driver Q. Hope this helps.

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