Quote:
Originally Posted by vampyretim
Thanks guys,
I've installed a 470k resistor and the hiss is a lot better.
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That's good. As you've reduced the resistor by a factot of 4, I'd expect the noise to be 12dB lower than with the 2.2meg. That's a very noticeable improvement.
Of course, once the preamp is connected, its low output impedance will dominate the thermal noise picture at the power amp input, so the change from 2.2meg to 470k will have been a bit academic. It'll then be the input stage of the preamp that will generate most of the audible noise.
Martin