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In Reply to: Question for you Mike re four ohm speakers......... posted by Roger Hill on November 17, 2005 at 10:58:46:
I may not bee understanding your question properly. but if your building a set of speakers with 4 ohm drivers... then, yes... you should use the four ohm tap arrangement for the FS 007.
Again, if I missed the mark (your Q) let me know.
my question is perhaps a bit of worry-wart in nature, so let me try it this way: is there any inherent downside in going to a four ohm speaker system, using the 4 ohm taps, compared to an eight ohm speaker system using the eight ohm taps? I can't see why the amps would know the difference, but If one exists, I'm sure you know about it. At this stage of the design, I can redirect my efforts to an eight ohm system if it has some inherent advantage. Thanks,
It depends on the transformer design. Good transformers (including all of Mike's that I know about) take pains to make sure the response does not change with different output impedances. On some less sophisticated tapped designs, the highest impedance tap has the least leakage inductance, and therefor the best high frequency response.
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