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In Reply to: RE: I was using a different chart posted by Lew on June 07, 2012 at 06:56:24
"The bass transformer, which is the same whether or not one uses the new mod, never gets anywhere near 7 ohms in my speakers (at all frequencies, the impedances I measured were higher),"
I have info from one SLOG member who told me that the bass transformer DCR has changed over the years. I suppose it is hard to ensure uniformity through the years.
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DCR would have little to do with large differences in speaker impedance except maybe it's an indication that they also played with the turns ratio over the years. The turns ratio is by far the primary determinant of the impedance seen by the amplifier, but a change in turns ratio would probably be reflected in a small change in DCR.
Right. IOW this has to do with how the driver interacts with the transformer. I'm not sure I'm on board with the idea that the peak represents a resonance. If that were the case then bass would really be a problem with our amps since the impedance is so high in the bass, but its not.
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