Here are the specs for the Focusrite If you "Focus" on the EIN number, this measures the noise. Here the figure is -120dB, and it needs to be in the -128 to -129.5 range, if properly measured, (budget gear is never properly measured, so add a few points). What this means is that when you add the noise of the mic to the noise of the preamp, you get, well, noise. Not a lot of noise, but noticeable on a lute recording. Why the noise? Well, one reason is that it is powered by the USB bus. USB really does not have the power to run a mic preamp on a budget system. dt Frequency Response 20Hz - 20kHz +/- 0.1 dB THD+N < 0.002% (minimum gain, -1dBFS input with 22Hz/22kHz bandpass filter) Equivalent Input Noise (EIN) < -120dB: measured at 55dB of gain with 150I(c) termination (20Hz/22kHz bandpass filter) Gain Range +10dB to +55dB Max Input Level -3dBu
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