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In Reply to: Alnico magnet posted by kintyre695 on February 19, 2007 at 06:48:40:
Many older speakers used iron-core inductors that appear exactly like transformers in construction, just like chokes do. Continuity or resistance measurement would deduce if a tapped inductor (single coil) or a separate primary winding & separate secondary winding transformer. Tracing out the existing wiring could reveal whether applied in series or shunt with signal as an inductor or applied as a real transformer. BTW, Direct Current resistance measurements do not equate to impedance nor inductance.
Follow Ups:
Thanks Ron. Don't understand the sentence
"Continuity or resistance measurement would deduce if a tapped inductor (single coil) or a separate primary winding & separate secondary winding transformer"From the Jensen literature, it would appear that one of the inductors/transformers was for an impedence control.
Both have unfortunately been disconnected, although I can see in the crossover where the one inductor/transformer wires went.
There are four wires for each inductor/transformer.
There are as I recall eight connection posts in the crossover and the new wiring bridges several of these together.
I should get my son to take a pic so I can post what it looks like now.
If you have a multi-meter, read it's instuctions per making continuity measurements. As when the meter is set for High resistance measurements, touching both probes together should indicate Zero or very low resistance = continuity; & likewise with any circut or winding when probes measure across. IF this is a tapped inductor, any one wire lead will show continuity with all other wire leads. However, IF this were a Transformer, there would be NO continuity between separate primary & secondary windings.
thank you Ron I will try this.
This is a triaxial speaker, but insofar as it is was a later model by Jensen, there are similarities.The manual indicates that they are transformers, not inductors, and the reason for them is to be able to change the impedence of the speaker from 4, 8 and 16 ohm and the high impedence that the field coils used. The manual gives the combination of the transformers and the hookups used to achieve the desired result.
Thx everyone for your responses.
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