This switch is used to enable or disable the 4 band equalization circuit.
In the “out” position, all equalizer bands are bypassed. When in the
bypass position, the active balanced input stage, the active balanced
output stage, and the transformer remains operational. This allows the
levels to match when comparing the equalized signal to the unequalized
signal.
A green LED indicates the operation of the equalizer.
The low frequency sweep control is used in conjunction with the low
boost/cut control and provides continuous
adjustment of the center frequency from 20Hz
(fully counterclockwise) to 400Hz (fully
clockwise). The Bandwidth (Q) of the low band
is fixed at 1 octave (Q=1.0)
The boost/cut control provides a reciprocal
volume adjustment of the selected frequency
control. This means that whatever frequency is
“boosted” with the boost/cut adjusted from its
center position clockwise, an identical but
opposite result is achieved when that same
frequency selection is “cut” from its center
position counterclockwise. Once the desired
frequency has been selected with the low
frequency sweep control, that frequency may be
continuously accentuated or attenuated (boost or
cut) from 0 to +15dB or -15dB. 0dB (flat) is obtained when this control
is set to its center detented position.
This switch changes the low frequency band from a peak/dip curve (as
shown in Figure 1a) to shelving curve (as shown in Figure 1b).
.
8. Low frequency sweep
7. Equalizer bypass switch
Fig. 1a. Shelving Curve
Fig. 1b. Peak/Dip Curve
9. Low boost/cut
10. Peak/Shelf Switch
L (Low) BAND
7
8
9
10
Chapter 3
Operation Section
12
