11
EQ CONTROLS
EQ In
This switch engages all EQ frequency bands except the HPF.
LF
Adjusts up to 15 dB of boost or cut at the selected low frequencies. Cut can be used
as a variable, and potentially more gentle alternative to using the HPF. Remember
to reduce the signal level at the source to minimize the potential for clipping when
any of the 3 bands are boosted significantly.
Low Freq
The LOW FREQ rotary switch has 4 positions for selecting one of four corner or
center frequencies in the low band EQ section. The frequencies are 35 Hz, 60 Hz,
100 Hz and 220 Hz.
LF Peak
When the button is out, the low frequency band operates in shelf mode, boosting
or cutting below the corner frequency. Above the corner frequency the amount
of boost or cut gradually diminishes at approximately 6 dB/octave. With the HI
PEAK button pressed the low frequency band changes to peak mode with a bell
shaped boost or cut curve. Utilizing the LF PEAK button and LF FREQ rotary
switch, an engineer has 8 tonal variations of EQ shapes to finesse the bottom end,
in addition to the high pass filter that can be introduced for further tightening and
manipulation.
Mid Hi Q
The resonance or Q of the mid band at maximum boost is typically 2 when the
button is out. When the MID HI Q is pressed at maximum boost, the Q narrows
to approximately 3.5. The Q widens nicely with less boost or cut as is typical for
passive EQ circuits. The Q tends to be slightly wider when the frequency is set
lower, and slightly narrower for higher frequency selections. The Q is asymmetrical
by design: meaning that the Q for cutting frequencies is narrower than the Q for
boosting a particular frequency
Mid
Adjusts up to 15 dB of boost or cut at the selected mid frequencies. Remember to
reduce the signal level at the source to minimize the potential for clipping when
any of the 3 bands are boosted significantly.
