LM Band.
The LM (Low-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.
The centre frequency is set by a continuously variable (swept) control, which ranges
from 50Hz to 2KHz. The mid bands possess a moderatly low Q, medium bandwidth,
response which results in effective equalisation without harshness, and provides a
good degree of overlap between the frequency options.
The amount of cut or boost is again controlled by a continuously variable, centre-
detented rotary knob, with up to 15dB of cut and boost available at the centre
frequencies. Response curves for the mid bands are also shown in the specification
section of this manual.
HM Band.
The HM (High-Mid Frequency) band is similar in operation to the LM band, except
that the centre frequency range is obviously higher. The sweep range is from 500Hz to
18KHz.
HF Band.
The HF (High Frequency) band has a shelving characteristic, complimenting the LF
band. Corner frequency selection is by push switch to 8KHz or 12KHz.
Bypass.
The Equaliser In switch allows the processing to be bypassed for comparison of the
equalised and original, unprocessed signal. A green LED is illuminated when the EQ
is in circuit.
