API Audio The Channel Strip - Manual (Page 22)

5.2 Equalizer Controls
The 550A Equalizer provides three (3) bands of equalization and a band-pass filter.
• IN: Activates/deactivates the 550A Equalizer internal bypass
• CENTER FREQUENCY (Knob): Seven (7) center frequencies indicated in blue numbers
• BOOST/CUT (Ring): +/- 12dB indicated in white numbers
• HIGH SHELVING: High band peaking/shelving switch
• LOW SHELVING: Low band peaking/shelving switch
• B.P. Filter: Band-pass Filter IN/OUT
• POST EQ: Moves the 527 Compressor to post the 550A Equalizer in the audio path
• EQ BYPASS (Equalizer Bypass): Completely removes the 550A Equalizer from
5.2.1 Low Frequency Band
Low Frequency:
• Center Frequency (knob): 30Hz, 40Hz, 50Hz, 100Hz, 200Hz,
300Hz, 400Hz
• Boost/Cut (ring): +/- 12dB
• Switchable shelving
Low Frequency Shelving: Changes the low frequency band from a peaking EQ to a
shelving EQ
• All frequencies below the selected center frequency will be boost or cut
• Illuminates when engaged
5.2.2 Mid Frequency Band
Mid Frequency:
• Center Frequency (knob): sets 200Hz, 400Hz, 600Hz, 800Hz,
1.5kHz, 3kHz, 5kHz
• Boost/Cut (ring): +/- 12dB
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