Thermionic Culture THE FREEBIRD 3 channel equalizer - Manual (Page 7)

©Thermionic Culture Ltd., May 2011 6
4 Controls and Operation
4.1
Gain
The rotary gain control is located at the top of each
channel. It allows the channel gain to be attenuated
continuously at the input to give a channel gain of
between -12dB and +5dB (when the EQ is set to flat).
This can be used either to adjust the EQ'd channel to
unity gain or to change the gain so as not to distort the
unit if high levels of positive EQ are added.
4.2 Top
The rotary gain control allows the amount of top EQ to
be adjusted continuously between +14dB and -16dB.
The EQ has a shelving type curve, reaching it's
peak/trough at either 9kHz or 15kHz depending upon
the position of the two way frequency selector switch.
4.3
Mid Cut
The rotary gain control allows the amount of mid cut
EQ to be adjusted continuously between 0 and -20dB.
The EQ is set at a fixed frequency of 700Hz. The Q of
the curve increases as the trough level is increased.
4.4
Presence
This switch allows for five different preset presence
EQ curves to be applied to the signal. The curve is
quite unique to this equaliser. It acts partly as a high
pass shelf curve, but has a peak near the beginning of
the curve, followed by a drop at the upper audible
range of the curve.
The curves are set at:-
L:
+3dB @1kHz H+: +5dB @3kHz
M: +4dB @1.5kHz H++: +8dB @3kHz
H: +3dB @ 3kHz