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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Reducing Noise by Choosing Impedances posted by Charles Peterson on December 29, 2005 at 17:15:59:
With line level components we are really trying to transfer voltage - not power, so impedance matching is not a big issue. This is why a preamp or crossove may have a very low output impedance, 100 Ohms or Less. It's output buffer amplifier ia usually designed to operate with this "higher" current load. When you see the rare solid state amp (and many tube designs) with a higher output impedance - it could be to protect the output device by limiting its current. Since, as you said, most Power Amps have 20K to 100K input impedances (your 33K is probably typical) even a 5K output impedance will allow good voltage transfer. However, as you note, some power amps Noise floors are affected by the volume position, this is also true of Preamps. This is because the electronics noise is related to current levels and not voltage. It takes special design efforts to make sure this noise change vs. attenuator position does not occur. Most designers tend to discount it any way.I have experimented with my system to find the optimum combination for the lowest noise, which I think is one of the most important characteristics of resolving the most detail and realism in hi-fi music reproduction.
This is also another reason to go for a integrated amp -though not applicable in you biamp application. With an IntAmp only the designer can screw it up, not the user.
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Follow Ups
- Re: Reducing Noise by Choosing Impedances - gymwear5@hotmail.com 07:21:32 12/30/05 (0)
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