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#41
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Phil Allison > wrote:
>Scott Dorsey wrote: > >> 4. All the GkTB equations we were forced to memorize in school are useful at >> RF but not useful in a mismatched low frequency world. > >** False. Johnson noise is dominant in any resistive source situation. Resistive source? An SM-57? I think maybe this is where one of the problems is located. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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#42
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Scott Dorsey wrote:
--------------------- > > > >> 4. All the GkTB equations we were forced to memorize in school are useful at > >> RF but not useful in a mismatched low frequency world. > > > >** False. Johnson noise is dominant in any resistive source situation. > > Resistive source? An SM-57? > ** Run an impedance test yourself. From a few hundred Hz up to 15kHz, it is nearly flat. There is a broad peak around 120Hz IIRC. Essentially a 270 ohm source. The internal auto-tranny just ups the value by a factor of 20 from the 13 ohms capsule. Reason why makers use a simple resistor for pre-amp specifications. And the type does not matter !! .... Phil I think maybe this is where one of the problems > is located. > --scott > > > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." |
#43
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