Thermionic Culture THE FREEBIRD 3 channel equalizer - Manual (Page 8)

©Thermionic Culture Ltd., May 2011 7
The 'M' setting is the original design, which simply
gives a very broad lift to mid and top.
The lowest setting 'L' gives a very useful thickness to
instruments like guitars.
The 'H' settings are three increasing amounts of curve
which focuses around the high mids of the signal. This
can be useful for vocals or anything that needs to be
brightened and brought forward.
4.5 Bass
The rotary gain control allows the amount of bass EQ
to be adjusted continuously between ±11dB. The EQ
has a shelving type curve, reaching it's peak/trough at
either 50Hz or 100Hz depending upon the position of
the two way frequency selector switch.
4.6
HPF
The high pass filter switch gives the user a 12dB per
octave filter which is 8dB down at either 25Hz or
65Hz.
These frequencies and filter slope work very well in
conjunction with the 'Bass' control. This effectively
allows the user to simply remove problem frequencies
from a sound, or to allow the bass frequencies to be
enhanced dramatically, without any danger of
producing frequencies that interfere with the action of
loudspeakers.
4.7
Bypass
This switch provides a hardwired bypass that simply
connects the unit's inputs and outputs together,
completely bypassing the unit's electronics. When the
switch is up, The Freebird is in circuit and when down
it is completely bypassed.