TL Audio A3 - Manual (Page 17)

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LF Band.
The LF (Low Frequency) band of the equalizer has a shelving characteristic - i.e. it
extends from the selected frequency to the extreme low frequency limit of the
equaliser’s response.
The cut or boost is controlled by a continuously variable, centre-dented, rotary knob -
up to 15dB of cut and boost is available. The slope of the shelf is 12dB/octave.
Mid Band.
The Mid Frequency band has a peaking characteristic - i.e. it boosts or cuts a section
of the audio spectrum around its selected centre frequency only. A rotary switch from
150Hz to 7kHz selects the centre frequency of the Mid band. The mid band possesses
a fairly low Q value of approximately 0.5, for a response which results in effective
equalisation without harshness.
HF Band.
The HF (High Frequency) band has a shelving characteristic, complimenting the LF
band. The centre frequency is at 12kHz.
EQ On.
The ‘EQ On’ switch allows the EQ section to be bypassed for comparison of the
equalised and original, unprocessed signal.
EQ Pre.
The ‘EQ Pre’ switch places the equaliser ahead of the compressor section in
the signal path. This enables more flexibility in sound, since the compressor
will become more sensitive to any frequencies that have been boosted by the
EQ section. The effect may be compared by toggling the EQ Pre switch.
Output Gain.
This controls the level at the Ebony A3output. The nominal level is 0dB at the centre
detented position. This control effectively acts like an output fader, and is very useful
when recording direct to tape or hard disc through the Ebony A3. You may find that
some digital recorders require a good deal of input level in order to register a 0dB
reading on their meters (+18dBu analogue usually matches 0dBFS in the digital
domain). This is normal, since many digital recorders are designed to preserve
headroom and keep the signal well below the 0dB clip point - thus preventing the