Empress Effects ParaEq - Manual (Page 9)

Bass Guitar
30Hz – 80Hz: The sub-bass region. Be careful when boosting in this
range; your speakers might not be happy if you boost too much.
80Hz – 150Hz: The bass region. Boost and cut in this region to
change the amount of bass in your sound.
150Hz – 500Hz: If your bass sounds too muddy, try cutting in this
region. If it needs a little warmth, try boosting in this region.
500Hz – 900Hz: Boosting in this region can add mid-range growl to
your tone. Cutting in this region can make things clean and pristine.
900Hz – 3kHz: Boosting in this region can bring out attack. Cutting in
this region can help create a rounder tone.
Above 3kHz: Cutting can bring down the noise without much effect
on the signal. Boosting can add a sense of air and space.