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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.
Odyno
Follow Ups:
Just to clarify, in RF work they do impedance matching for maximum power transfer. In audio we do intentional, engineered impedance mismatching to achieve a tradeoff of fidelity for efficiency. We try to lightly load sources rather than match their impedance. I've done a little math and it seems maximum distortion comes at the same point as maximum power transfer. That's fine for RF, where you filter everything but the tight band of frequencies you want (getting rid of harmonic distortion) but not fine for audio, which is inherently wideband.
If I understand, the dynamic I loose with the passive cant be gained.
The problem been fixed with devise such as the TVC Promitheus Audio cannot be done a regular resistive pre with small transformer?
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
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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