<<Making the generous assumption that the Quadmic noise is -129 dBV,
it's 10 dB quieter than the microphone. That's good, but maybe not
good enough. If you rms those two noise sources together that gives
you a 2.4 dB increase in noise relative to the microphone with a
'perfect' preamplifier. OK, 2.4 dB isn't a substantial hit in
performance. But you pay a lot for those quiet microphones!>>
Since the preamp noise & the mic noise is not coherent I would not
expect them to sum as you indicate. Two sine waves would, but I
believe noise, which is random, would produce a much lower sum result.
The stated EIN of -129 dBV is approximately equal to the better studio
grade mic preamps & if the RME achieves that in the field on battery
power it will certainly not be the source of noise degradation for any
recordings you make with it.
Scott Fraser
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