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In Reply to: Impedance matching. posted by Odyno on January 9, 2007 at 22:40:43:
I have seen something here a while back about small transformer to match impedance with passive pre amp.
Good quality transformer that can be installed inside my small QED passive box.
This would help to get away with the amorphous sound usually associated with passive pre-amp.If by impedance matching you mean something which would reduce the output impedance of your passive, that can be done with a step-down transformer, but that will only work if your amplifier has a fair amount of excess gain. That's because a transformer can't reduce the output impedance of your passive without also reducing the signal level.
se
Follow Ups:
Not at all!
Actually the transformer would have to be one for one.
This to avoid mismatch between to component.
Odyno
You gain nothing with a one to one transformer. If you have 10k going into the transformer, you have 10k coming out. Steve Eddy is correct you need a step down transformer. However you also are going to lose gain. The trade-off is not worth it.
You gain nothing with a one to one transformer. If you have 10k going into the transformer, you have 10k coming out.
Correct. And not only that, the output impedance would be the same as with the pot. Well, for an IDEAL transformer. For a realworld transformer, the output impedance would be somewhat higher due to winding resistance, etc.
se
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