You therefore will now increase the gain with the System Preferences. But again, these level meters are only an indication that something is happening. The blue input level meters should work when you speak into the microphone. If you have Audio Hijack on your system, open it now. We can fix that by cranking up the gain with the slider, but the System Preferences Input level display gives too little feedback to be of use. Now speak at a normal voice and look at the Input level.
If you have one available on your Mac, use that one. As for audio editors, Audio Hijack is great, but Sony Sound Forge Pro 2 is better because it has more features that we can use for optimisation of the input signal. Here is how you set it for optimum results. The NT-USB has an optimised gain for its internal circuits, but unless you have a loud voice, that gain setting may be too low.
To get best results from a USB microphone you need to set the gain correctly.
