TL Audio 5052 - Manual (Page 21)

reduction of a narrow band whilst simultaneously boosting an overlapping broader
band of frequencies, for example. Used individually or in combination, the filter
bands allow comprehensive equalisation of any audio signal.
4.23 Cut/Boost Control.
Each of the four EQ bands has a +/- 15dB gain control that is used to apply cut or
boost at the frequency selected by the Frequency control. Often, EQ-ing is as much
about cutting frequencies as it is about boosting them, and removing excessive bass
or mid frequencies from signals to help them sit better in the mix is a common
recording technique. On the other hand TL Audio EQs are renowned for being very
musical - and very forgiving - so you may find yourself being able to apply a lot more
boost than other EQs, and the sound will still retain its quality and not be destroyed
- as is often the case on cheap or poorly designed EQ sections, particularly when
pushed hard.
4.24 Frequency Control.
This control sets the Frequency on each band that is to be cut or boosted. The
frequencies are continuously variable over the following ranges:
LF band: 30Hz to 1kHz
LM band: 50Hz to 1.5kHz
HM band: 1kHz to 12kHz
HF band: 3kHz to 20kHz
4.25 Q (Bandwidth) Control.
A bandwidth control is provided on the LM and HM bands of the 5052, making
these filters fully parametric. The “Q” of the filter is a measure of the shape of the
frequency response curve, and is closely related to the ‘bandwidth’ or range of
frequencies controlled by the filter. A narrow bandwidth (high Q) setting means that
a tight band of frequencies either side of the selected centre frequency is affected
by any cut or boost actions, while a wide bandwidth (low Q) affects a much broader
band of frequencies.
As a result, high Q settings (about 7 at the maximum setting on the 5052, which
roughly corresponds to a bandwidth of 0.15 octaves) are generally used for audio
correction or effects - for instance when a single troublesome frequency needs to be