Manual

UAD Powered Plug-Ins Manual - 64 - Chapter 4: API Vision Console Channel Strip
550L Four-Band
Equalizer
The 550L EQ is divided into four frequency bands: High
Frequency (HF), High Midrange Frequency (HMF), Low
Midrange Frequency (LMF), and Low Frequency (LF).
The 550L features API’s “Proportional Q” which continu-
ously narrows the bandwidth of the filter as band gain is
increased, providing (as stated by API) “an uncompli-
cated way to generate acoustically superior equaliza-
tion.” The boost and cut characteristics are identical, al-
lowing previous actions to be undone if desired.
Band Controls
The four EQ bands (HF/HMF/LMF/LF) are controlled by
dual-concentric switches. The inner knob controls the
band frequency (values in blue text) and the outer knob
controls the band gain (values in white text). Available
values for these controls are listed in the table below.
Frequency
Frequency determines the center frequency of the band
when the band is in peak mode (all bands) and the cutoff frequency when the
band is in shelf mode (available with HF/LF bands only). The frequency for
the band can be set using any of these four methods:
• Drag the inner concentric knob to the desired value
• Hover over the inner concentric knob then use the mouse scroll wheel
• Click directly on the frequency value label to switch to that value
• Click on the band label (HF/HMF/LMF/LF) to cycle through available val-
ues (shift+click to cycle in reverse)
Table 9. API 550L Frequency and Gain Values
Band Frequency Values Gain Values
High Frequency
(HF)
20, 15, 12.5, 10, 7, 5,
2.5 (kHz)
0
2
4
6
9
12
(±dB)
Low Mid Freq
(LMF)
12.5, 10, 8, 5, 3, 1.5
(kHz), 800 (Hz)
High Mid Freq
(HMF)
1000, 700, 500, 240,
180, 150, 75 (Hz)
Low Frequency
(LF)
400, 300, 200, 100,
50, 40, 30 (Hz)
Default values indicated in bold text above.