PhilNYC;216445 Wrote: 
> I've always known it to be 100x.  Most amps that I've seen have an input
> impedance between 10K-200Kohms, and most preamps I've seen have output
> impedance between 100ohms-200ohms.

The usual advice (pretty sure about this) is to aim for load input
impedance to be at least 10 times the source output impedance, for line
level signals. But I like your rule more - to be precise, exactly 10
times more! :)


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