This EQ is modelled on the EQ section of the Allen & Heath™ GL series mixing desk.
It is a 4-band EQ (equaliser) with two semi-parametric mids and provides independent control of four frequency bands plus a low frequency roll-off switch (HPF). Allen & Heath (along with Soundcraft and Neve) are well known for their distinctive “British EQ”. The two “mid” filters are bell shaped peak/dip filters which affect frequencies around a centre point which can be swept from 500Hz to 15kHz, and 35Hz to 1kHz respectively. The width of the band is selected to provide effective control for both creative and corrective equalisation.
- 100 Hz HPF: (+/- 15 dB) attenuates frequencies below 100Hz by 12dB per octave. It may be used to reduce low frequency noise such as microphone popping, stage noise and tape transport rumble.
- HF Gain: sets the gain of the high frequency shelf filter which boosts or cuts high frequencies. Positive values will tend to make the sound “brighter”. Negative values will tend to make the sound less bright.
- High-Mid Frequency: (500Hz to 15kHz) sets the centre frequency of the high-mid band filter.
- High-Mid Gain: (+/- 15 dB) sets the gain of the high-mid band filter.
- Low-Mid Frequency: (35Hz to 1kHz) sets the centre frequency of the low-mid band filter.
- Low-Mid Gain: (+/- 15 dB) sets the gain of the low-mid band filter.
- LF Gain: (+/- 15 dB) sets the gain of the low frequency shelf filter. Positive values will tend to give the sound more bass and negative values will reduce the bass.
The actual boost/cut in dB is approximate as it is shaped to be “musical” rather than numerically exact.
If the track sample rate is less than 30 kHz, the High-Mid filter will be limited to an upper frequency range of half the sample rate.
If the track sample rate is less than 24 kHz an error message will be shown.
desk-eq.ny (2.1 KB)
The latest version is available on the Audacity wiki: http://wiki.audacityteam.org/wiki/Nyquist_Effect_Plug-ins#Desk_EQ