Set up the microphone near the acoustic bass, 6 inches from the sound port (the middle hole in the body for acoustic guitar or side "F" cuts for an upright). Open the music recording software.
Open the equalization submenu interface in the recording software by clicking the "File" tab and then "Equalization." Click the wave form that appears in the interface. Drag the wave form's right side and drag it down to the "50hz" tick mark.
Click the left side of the wave form and drag it to the "100hz" tick mark; the entire form will now resemble a diagonal line instead of a curve. Click "Ok" or "Apply" depending on the program. Record the bass normally.