The following plots show the frequency-response curves for the low frequency (LF) and low-mid frequency (LMF) bands with varying amounts of gain and Q. In all cases the plots show the responses at the default frequencies for the band.
GainThe LF shelf band features the following frequency response, from -12 to +12 dB with no Q applied:
and the LMF band:
Note how the boost/cut shape is asymmetric with a broader boost curve and a more focused cut response.
QThe LF shelf band features the following frequency response, at +12 dB with Q applied in 20% steps from 0 to 100%:
and at -12 dB:
Note how the boost response dips below 0 dB and the cut response rises above it as the Q is increased.
The LMF band at -12 dB and +12 dB over the same Q range: