Using the Low and High Filters
The Low and High filters are usually used to correct problems with a signal rather
than being used in a creative way (for example, to create a special ef fect).
Use the Low filter to remove:
Unwanted rumble.
Bass lift (a pr oximity effect of microphones, giving a bass boost as the singer gets
closer to the microphone). This is most apparent with unidirectional microphones.
Hum from noisy sources.
Use the High filter to remove:
Unwanted hiss.
High-frequency bleed-through from other sources when recording bassy signals
(such as bass drum).
A possible creative use of the Low and High filters is to put them full on together,
which gives an effect similar to a telephone or transistor radio.
Low and High Eq
The Low and High Eq are very flexible, as they can be used in either shelf mode or
bell mode. When the
switch is not lit, the Low and High Eq are in shelf mode,
which is described in the rest of this section; when the
switch is lit, the Low and
High Eq are in bell mode, and act like the parametrics (Low Mid and High Mid Eq),
except that they have a fixed Q. For more details of using parametrics, see the sec-
tion on Low Mid Eq and High Mid Eq.
f o c u s e q
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