Manual

14
2.5.1 Shelving Overshoot Control (HF shelf Q control)
When the HF shelving function is selected, the Q control provides control of the ‘overshoot’
function.
With the Q control set to minimum (yellow plot) the section has no overshoot and performs a
basic and accurate shelving function. This is most like the responses provided by the original
SSL 4000 EQs and many other outboard units often described as ‘clean’ EQs. Although these
are still very popular units, some engineers complain that they can sound harsh and
overbearing in comparison with legacy EQs.
As the Q control is increased, the overshoot factor is also increased. For example, the red plot
shows a slight dip in the response at around 1.5KHz for a boosted HF setting of 6KHz. This
has the effect of suppressing the perceived mid range boost that occurs with the previous
‘clean’ variety, reducing the apparent ‘hardness’ of the sound. This, along with the increased
slope rate, provides more apparent definition to the EQ in the band of interest.