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In Reply to: RE: What is impedance and how does it work posted by airtime on April 07, 2014 at 08:21:05
There's output impedance from the preamp and input impedance in the amplifier.The input impedance of your amplifier can be considered the "load" placed on your premap. If the load on your preamp is too low, distortion will go up, and potentially the frequency response on the bottom end will be compromised.
As the load on the preamp increases (amp inmput impedance goes up), you will actually lose less signal from the preamp, and the distortion that the preamp produces will drop drastically.
As a general rule of thumb, we like to see an input impedance that is at least 10X the output impedance of the preamp driving it. So for a preamp with a 1K output impedance, 10K would be a recommended minimum. Generally, there isn't any harm in going much higher (100X).
Edits: 04/07/14Follow Ups:
You might have it backwards. The term "load" refers to conductance rather than resistance. In other words, a heavy load equates to low resistance or impedance. Therefore, as the load increases, the resistance or impedance is reduced. For example, 10k-ohms input impedance represents a greater load than 100k-ohms.
Best regards,
John Elison
Thanks for pointing that out, I amended my post for clarification.
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