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[Jim McKeveny]

Over the years I've observed cones with the same model number and specs, aside from the impedance rating. What in the VC winding methods allows for this "consistent variance", if you will..

[Art Welter]

Over the years I've observed cones with the same model number and specs, aside from the impedance rating. What in the VC winding methods allows for this "consistent variance", if you will..

What "consistent variance" are you observing?

Windings of different gauge and aspect ratio (flatwound, rectangular, round) and the amount of layers used can all result in different impedance.

[Ivan Beaver]

Over the years I've observed cones with the same model number and specs, aside from the impedance rating. What in the VC winding methods allows for this "consistent variance", if you will..

The size of the wire used will also affect the impedance.

[Jim McKeveny]

With all other specs apparently constant, how is a JBL "H" different "from a "G"?

[Mike Caldwell]

With all other specs apparently constant, how is a JBL "H" different "from a "G"?

In the JBL world H denotes an 8 ohm speaker, G is a 4 ohm speaker and J is 16 ohms.
Those are the average impedance values.

DC resistance for an H would be around 5 ohms, G closer to 2 ohms and J is about 10 ohms.

[John Roberts {JR}]

Loudspeakers are not simple resistors so impedance can be complex and somewhat frequency dependent.

JR

[Jim McKeveny]

Maybe I wasn't clear enough: What are the differences in the voice coils that allow for a different impedance rating while maintaining other response specs & T/S parameters? From manufacturer specs, gauge and winding depth are same.

[Riley Casey]

As Ivan said, diameter of the voice coil wire and to a less employed extent the length of the wire. Smaller wire results in a higher impedance for a given length.

[Jim McKeveny]

As Ivan said, diameter of the voice coil wire and to a less employed extent the length of the wire. Smaller wire results in a higher impedance for a given length.

It just seems counterintuitive that a gauge and length change only affects impedance. Specified electrical parameters remain the same.

[Mike Caldwell]

It just seems counterintuitive that a gauge and length change only affects impedance. Specified electrical parameters remain the same.

The inductance will change, on a woofer the weight of the voice coil wire difference would not make much difference.

[ProSoundWeb Community]