3.4 Channel Equalizer: 500 Slot:
The channel 500 Slot may be fitted with one of two equalizer choices:
•
550L Discrete 4-Band EQ
•
560L Graphic EQ
3.4.1 550L Discrete 4-Band Equalizer
NOTE: The switches on this module are not part of the automation or recall systems.
The 550L Equalizer is the console version of the famous API 550B all-discrete
4-Band EQ.
The 550L has the following features:
•
4-Bands
•
+/- 12 dB of boost or cut
•
High and Low bands can be peaking or shelving
•
Mid-bands are peaking
•
Hard bypass with indicator
The controls for the 550L EQ function as follows:
Frequency Selection (Center Knob): Selects the center
frequency for the selected band. Center frequencies vary
by band:
•
High: 2.5kHz, 5kHz, 7kHz, 10kHz, 12.5kHz,
15kHz, 20kHz
•
High-Mids: 800Hz, 1.5kHz, 3kHz, 5kHz, 8kHz,
12.5kHz
•
Low-Mids: 75Hz, 150Hz, 180Hz, 240Hz, 500Hz,
700Hz, 1kHz
•
Lows: 30Hz, 40Hz, 50Hz, 100Hz, 200Hz, 300Hz,
400Hz
•
Frequencies are indicated in blue numbers
Boost and Cut (Ring): Sets the amount of boost or cut for
the selected band
•
+ 12dB of boost or -12dB of cut
•
Decibels are indicated in white numbers
HF (High-Frequency) Peaking/Shelving Switch: Selects between
peaking and shelving EQ curves for the high-frequency band
LF (Low-Frequency) Peaking/Shelving Switch: Selects between peaking
and shelving EQ curves for the low-frequency band
EQ (On/Off switch): Activates the channel EQ
•
Hard bypass when not engaged
•
A green LED indicator illuminates when engaged
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Страница 232: ...The diagram below indicates which 1068L parameters are controlled by the automation and recall systems ...
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